HCGen is a great supp and in some cases it's a BETTER choice than HCG, however,if you're severely suppressed it will not replicate LH to the same level as the drug -- if that's what you're looking to do.
I agree with you about SERMS. They're libido killers for a lot of guys yet those who don't have that problem refuse to recognize it. I hate them. They suck for recovery anyway.
It sounds like you need to kickstart your HPTA. In all fairness, it may be a little late for the HCGen. You should have used it while on cycle. Now you need HCG or HMG.
Of course, HCG is just a boost. It doesn't "cure" anything. Your body needs to make T on its own and to help get over that hump, add some UNLEASHED, POST CYCLE and BRIDGE.
How's your estrogen? Prolactin levels? You may need to get them in checked as well.
If you're on HRT your LH will be zero anyway. That's a fact of life. Get your T and e in balance and the rest will take care of itself.