I've also used all three (clomid, nolva, with clen) together with success.
Remember, Human Chorionic Gonadotropin (HCG) by itself will not get you recovered. It simply gets your boys, who have most likely been atrophied for some number of weeks, back to size again so they will be ready for your pct.
In my opinion, the best way to use Human Chorionic Gonadotropin (HCG) is throughout your cycle, so as to prevent atrophy in the first place.