Arnold chest advice
 

UPPER PECS
You might think I’m going to suggest doing incline presses and flyes, but there’s much more to it. On inclines, I used to change the angle of the bench every set. I started at 15 degrees, then went up to 25, then 35, then 50 degrees. I often did two, sometimes three, sets at each angle. That way, no part of my upper chest escaped training.

I also firmly believe in incorporating heavy days to develop maximum size in the upper pecs. Once a week, I did extra-heavy inclines, no more than five or six reps per set. To complement that, I worked as many muscle-shocking principles into my routine as I could: forced reps, rest/pauses, drop sets, etc.

this is something will give a go hardly change my angle some of the benches in my gym are fixed at one angle
so often just use that one
will try this for few weeks see how its goes