A synthetic SERM (such as tamoxifen or clomiphene) pwns, but I understand your situation.
PCS and it's metabolites function as SERMs. I would recommend stacking PCS with an AI. ATD is an ok AI. Some love it. Some hate it. It's so so. My personal fave is 6-bromodione as found in Hyperdrol (by AX), aPCT (by AX), Cissusdrol (by GL), or Restore (by ALRI).
With PCT, you're number one objective is getting test levels back. Don't worry about cortisol, IMHO, the push for cortisol control is a little overexaggerated (though it never hurts). There's a lot of other overlooked variables attributing to keeping/not keeping your gains than just cortisol.
ZMA is too slow acting to have any benefit for PCT, in my personal opinion. If you're not taking ZMA regularly, don't bother taking it at all. Using in 30 day spurts is only gonna cut into discretionary income.