The following is just food for thought, so take it for what you feel it's worth. Without seeing what you looked like before starting your diet, 82kg to 71kg is 24 lbs. Wondering if you might have dropped too much weight and lost some size along the way (I know I did for my first show. Ended up winning the weight class but could have been bigger and fuller)? When you started training for your contest, did you train any differently? How long of a diet, and what was a typical day's diet?

As for chest, try 3 workout in a row focusing on upper and middle chest, then 1workout for lower? You just posted your leg workout, so I'll suggest that perhaps you want to split quads and hams? If you always crush quads first, you're more than likely a little gassed before training hams? Below is a copy of my current workout. The exercises are just representative, and can be switched to suit you needs. Just a guideline/suggestion. Quads and hams are split so I can focus hard on each.

Your back looks good. Just keep training for width and thickness.

Sunday: Chest/Abs
Incline Bench Press 4×10-15
Incline Hammer Press 4×10-15
Dumbbell Fly’s 3×10
Decline Cable Fly’s 3×8-12
Dips 3×10

Monday: Back/Calves
Rear Lat Pulldown Wide Grip 4×10
Machine Rows 4×10
One Arm Dumbbell Rows 4×10-15
Incline Machine Pulldown’s 4×10-15
Low Back Bench Extensions 4×10

Tuesday: Shoulders/Traps /Abs
Rear Delt Machine 4×10-15
Seated Dumbbell Shoulder Press 4×8-15
Seated Lateral Side Raises 4×10-15
Upright Row 4×10-12
Dumbbell Shrugs 4×10-15

Wednesday: Rest
Recovery

Thursday: Quads/ Triceps /Calves (Note I can't squat because of a lower back fusion)
Incline Leg Press 4×15
Seated Leg Press 4×15
Leg Extensions 5×20
Single Leg Extension 3×20
Triceps Cable Extension’s 4×10
Seated French Press 4×10
Cable Kick-Backs 4×10
5. Seated Calf Raises 4×10
Standing Calf Raises 3×8-12

Friday: Hamstrings/ Biceps /Abs
Lying Leg Curls 4×15-20
Seated Leg Curls 4×8-15
Hamstring One Leg Curls 4×10-15
Dumbbell or Machine Curls 4×10-15
Preacher One Arm Dumbbell Curls 4×10-15
Hammer Curls 4×10-15
Wrist Curls 5×10-15

Saturday: Rest
Recovery

__________________
I'm a hard knock flier and a rainbow rider, a straight shootin' son of a gun...

DISCLAIMER: I reserve the right to be wrong on every statement I make....

yes mate I did lose size
to be fair my diet knowledge was lacking really so I opted for keto and think reduced to far and was flat and had defo lost lot size and then took ages to even get back to same sort of size as was before
my plan for next time is to get good coach and stick to there plan

yes I did also start to train legs twice week splitting hams/calves and quads up and did find this was best time legs grew
but as said went through little lacking period where I didn't train them for couple months at all then started back with every now and then now im back to solid every week I was going to split them up bit
was just trying full arms day as arms lacked but have seem to come on well latley

this was how I think of changing as I cant train weekends that's family time but have mon-fri always

chest/tri
hams/calves
delts/traps
quads/calves
back/bi

I don't ever train abs reason ive found is im very thick in my waist and just don't want to make it any thicker

The routine you posted below looks good. How long of a diet are you thinking for your next contest? When you started to diet for your last contest, did you do anything differently training wise (e.g. lower weight higher reps, increase cardio?)? I know it's only through the internet, but if there's any pre-contest training advice I can share from my experiences, I'd be happy to.

__________________
I'm a hard knock flier and a rainbow rider, a straight shootin' son of a gun...

DISCLAIMER: I reserve the right to be wrong on every statement I make....

well I done 16 weeks prep but wasn't very lean at start I had put on great deal of weight and been off gear for quite some time

and as diet went on I did lack with strength so weight did become lighter for same sort of reps as was before normal pyramid system

cardio was from start and increased the way through it
ie started 1 20 mins a week then ended up 5-6 30-1hr sessions
my cardio is very much done outside or garden I like circuit training and love to flip big tyre I have

to be fair id done quite well on cut but very much messed up towards end as I made things more complicated than needed to be

thrs was delts/traps

smith machine press 7 sets 20,20,18,15,15,10
dumbbell side raise 4 sets 15-20
front raise with bar 3 sets 10
machine delt raise 4 sets 20
rear delt machine 4 sets 20,20,18,15
dumbbell bent over rear delts 3 sets 20
upper rows 4 sets 10-15
barbell shrugs 5 sets 20

I hope you don't mind me commenting?

16 weeks is a long time to diet and train for a contest - IMHO. 12 weeks would be the longest I would consider, but (for me) 10 weeks is plenty. Everyone is different though. My mistake for the first show that I did was to diet too long, and too calorie restrictive. As such, in addition to losing fat, I lost a fair amount of muscle and ended up (in my view) flat for the show. I did win the weight class, but could have come in with more muscle and fuller looking.

Obviously, the goal for a competitive bodybuilder is to come in as lean as possible while retaining as much muscle as possible. Based on my first experience with dieting and pre-contest preparation, the next show I did I moved up a weight class, was much larger and fuller and still very ripped. Came in second in my weight class in that show.

No doubt, you learned some good lessons from your first show and I would imagine you'll be in a better position to do some things differently for your next show. But, that's how we learn.

As far as losing strength, IMO, 8 weeks out from the contest date I'd add some AD-50, and 6 weeks out add some Halo. That should help with strength as well as hardening you up - IMHO.

Erich

__________________
I'm a hard knock flier and a rainbow rider, a straight shootin' son of a gun...

DISCLAIMER: I reserve the right to be wrong on every statement I make....

cheers mate
yeah I learned quite lot from doing it and defo lost lot size all down to lack of experience
but next time will be much better
but hey that's next year now so my focus is size for now

Friday done arms

tricep rope pushdown 7 set 12-20 reps
straight bar push down 4 sets 12-18 reps
ez bar skull crushers 4 sets 12-15 reps
dips 4 sets to failure

dumbbell preacher curl 6 sets 12-20
ez bar preacher curl 4 sets 12-20 reps
hammer curl 3 sets 12 each arm
straight bar curl 2 sets 25 reps just pump at end

right last week did train some days but with the cold not really worth logging

back yesterday

chest/tricep

flat barbell press 7 sets 20,20,15,15,10,10,7
cable fly 4 sets 15-20 reps
incline hammer press 4 sets 12-18
dips 4 sets to failure 20 at least
tricep rope pushdown 5 sets 10-20
straight bar pushdown 4 sets 15
dumbbell skull crushers superset with dumbbell close grip 3 sets cant remember reps