I had 310cc partials 1 week ago today so cant tell u from experience but they have changed aloads in one week, i may be wrong but from my research fluffing can happen anytime from 8-12 months po and dropping 3 months. Only because it says the muscle has to fully relax to allow the implant to expand. Some people will probably get fluffing before but i guess this is when to expect it by. X
I dont think overs do hun as u dont need to wait for the muscle to relax but there are girls on here that have overs and they say theirs got bigger even as far as 8 months po. I dont know much about overs though x