One point that you may consider is that the effects may long exceed the half-life.
According to the PDR
Pregnyl (HCG - human chorionic gonadotropin - )
It approves the following regimens depending on Physician's prefernce:
For cyrptochridism in pre-pubertal males not due to anatomcial obstruction
1- 4000 USP 3 x a week for 3 weeks
2- 5000 USP every 2nd day for 4 injections
3-15 injections of 500-1000 USP over 6 weeks
4- 500 USP 3x weekly for 4-6 weeks
For selected cases of of hypogonadotropic function
1- 500-1000 USP 3x a week for 3 weeks, followed by same dose 2 x a week for 3 weeks
2- 4000 USP 3 x a week for 6-9 months then reduced 2000 USP 3 x a week for 3 more months
Now I am guessing that steroid inhibition is not what the above indictated uses are for. It seems to me to try a selected dose for 3 x a week for a week or 2, and if that doesnt do it, do more. This does not seem to be an exact science here. Every other med in the PDR is pretty specific. I am also guessing 1 USP = 1 IU. But I will find out for sure on that.