This is what worries me I cannot be 100% sure. The reason I was edging towards estradiol as the culprit was purely based upon the fact that I didn't make huge gains during this time, just normal progress as far as I can remember. I would have also expected the low T symptoms to appear after cessation of the (possible) steroid use and HPTA supression became obvious and no longer masked by endogenous testosterone supplementation.
I felt better after I had stopped supplementing as opposed to worse which is what I would expect after HPTA shutdown. You are far more knowledgeable than me however so I cede to you.