I know this is an ancient post, but I'll put my 2 cents in. I've done post cycle therapy (pct) bith ways. In my experience HGC just doesn't work for me. When I've used it during a cycle, it has kept my nuts the same size. HOWEVER, as soon as I stop taking it post cycle therapy (pct), they shrink! Done the second way round, after a cycle it does little at all.
I now do super short cycles and completely avoid nut shrinkage, getting almost instant recovery and better gains.