Stay on the test, definitely 100%. I am in the same boat and you need to stay on it. Basically the reason people cycle on and off is to get the body back to producing test on its own. Since yours (and mine) does not, if you come off the test you will crash. Hard.

Some people go through PCT and some 'cruise' between cycles with test or EQ or something along those lines. Since your test level won't get back to normal anyway just stay on the test per doctor's orders and run your cycles that way. If you do plan on low level Dbol for 8 weeks I would just go 8 weeks on with the Dbol, see how you like it and how your body tolerates it, then adjust (or come back here for more advice) accordingly.

Basically the test between cycles is going to help get those est levels back down which is the only real effect you need to worry about at this point.