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Your questions were already replied in different threads but basically:

1) there isn’t a formula. It depends if you are primary or secondary and to which extent. There is one study that shows thar 250IU EOD got intra testicular testosterone levels back to 93% of baseline (after testosterone being chemically supressed)

2) HCG only works if you are secondary. Also sometimes the amount of HCG if you need to bring testosterone to upper range levels can cause high estradiol difficult to control with an AI. And some people simply don’t do well on HCG monotherapy

3) The only study on this used 500IU EOD. But everyone is different and HCG might not work to keep fertility in some cases

4) HCG mimics LH. Long story short for optimal spermatogenisis you need LH and FSH. Hence sometimes the need for FSH (HMG contains both LH and FSH) or clomid (without TRT) to increase both LH and FSH