Train heavy for bodybuilding, which will limit your poundage by default.
Reps between 8-15 is nothing compared to 1RM.
Plus, if you're on hormone cocktail, all you have to do is cause muscle trauma, and that's enough stimulus for muscle growth.
If you don't want to increase the weight, no problem.
Just employ, pre-exhaustion, drop sets, triple drop sets, or workout your muscle group multiple times per week as opposed only once.
All the bodybuilders that lifted heavy ass weights, are now riddled with overuse injuries in their old age. No Thanks.