You’re trying to reboot a completely shutdown system, not prevent atrophy on cycle with a mimetic. HcG in and of itself is suppressive, so using it when trying to turn back on is counterproductive.
Kel can probably speak better to this, but iirc it’s only actually useful as a preventative measure, not really a restorative. You’re beyond prevention at this point, and I’d wager a guess that your testicles are probably pretty similar to mine: resembling marbles.