I think during a long cycle, doing HCG here and there will help recovery when you end the cycle. It is supressive but so is the gear you take but it kicks "on" the testes for a while so when you come off and hit clomid or nolva (I prefer nolva) they have been working so they will come on faster. At least that is what I feel.

When I come off TRT 4 months a year. I do 2 500iu shots the last 2 weeks I do my trt shots. Plumps em up and when I start PCT I have a head start.

That said keeping them working even if ultimately suppressed is better than trying to "kickstart" dormant nuts from scratch.