Indicating that dosage means anything past say 8 weeks indicates your lack of understand ing the HPTA. Supraphysiological dosages of test, whether 250mg or 600mg, etc, will supress endogenous test production regardless.
Clomid works for some - its a crap-shoot. Just because it works for you does not mean it will work for someone else. And the fact that your dad recovers with nothing indicates you both may be genetic freaks
. But to make recommendations to run a small, half-ass PCT because of how YOU react to clomid isn't solid, dude - everyone is different.