It's not a matter of "rate" of diminshing gains as it is more of the catabolic fators you experience after a cycle, and how well you combat them. You must do everything you can to battle the catabolism. Read up on how to do so.

Also, the muscle is natural whether you used AAS or not. The body does not recognize it as "fake." It's just that the body cannot handle the upset in your bodies homeostasis. Once you're back to balance, the body holds it. Savvy?

Doc