Whalen I was stupid I took that shit for years with no real need as I have a lot of hair. Definitely had lower libido on it although not full blown impotence, sometimes I didn't perform though.
I stopped in the final year and in retrospect had a raging libido again, was thinking with my dick non-stop. Then being a tool I went on again for a couple of months and this time it went badly wrong, noticed testicular pain one day and possible shrinkage. When I finally put 2 + 2 together after checking the side effects on the net (after I noticed reduced watery ejac once) I quit immediately but sadly wasn't rewarded with a return to normal this time. After 3 weeks my T levels crashed and I had awful ed, brain fog, weight loss (muscle). About to start T therapy but not very optimistic.
It's interesting you tried high T as some form of androgen insensitivity seems the likeliest problem at the moment and that had been mooted as a possible remedy. Others have tried masteron without success.
Good luck with your efforts man and you maybe want to join in with the dialogue at propeciahelp.com as your TRT efforts would be of great interest.
Guys like Varga know their stuff but I fear we'll need a Nobel Prize winner to solve this one!