What's your age? Are you on HRT? The fact is most people can not maintain supraphysiological amounts of muscle without supraphysiological hormone levels. Your body does not want all that muscle and on it's own it won't hold it if left to attain homeostasis. I've been on straight for many years, I just do a somewhat lower dose for a while then raise it then switch etc. I'm a bodybuilder and carry a significant amount of muscle. Getting off would be detrimental to my health. My blood panels are done every 4 months and even at the highest doses (too high for me to ever do again) I was still high normal. Your body wants to be normal, I don't, so fuck nature IMO.
You will find totally conflicting info about receptor down regulation with AAS and you will find studies showing receptor upregulation with AAS use. I'm inclined to believe the latter IME.