Old thread, and the OP is gone, but I can offer some practical advice: I am on trt 200 mg per week and by week 10 m losing sex drive and erectile ability.
That is when I run a pct. I am on 10 mg of Nolva for the 10 weeks, but bump it up tp 20 near the end. I then run HCG in a fairly large dose (1500 IU's eod)and add an AI like Dex or letro. I keep nolva steady and one day defore last shot of HCG add Clomid, 100mg per day for 7-10 days and then drop down tp 50 mg for 7-8 days.
The above worked well for me for many years, until my late 40's and it seems that my endocrine system just can't be propped up anymore.
However, when I go back to 200mg a week of test, my libido and erectile function are good again