First you want your pct to recover your HPTA back to homeostasis. Second you want to maintain your gains from your previous cycle.
I personally just keep my pct simple as possible hcg 1000 iu eod for 10 days, then start standard nolv/clomid/aromasin doses for 4 weeks and run the ostarine 15 mg at the start of 2nd week into pct, just enough to keep your gains and maybe even make some gains, yet not risk suppression during pct. After the last day of pct I start a 20 day regime of DSIP 250 mcg ed and stop ostarine after 6 weeks. 8 weeks after dropping nolv/clomid would be ideal to get bloodwork done to see if you recovered or not.
There's no sense in going crazy on a stack that may or may not work, but ostarine has been tested by several members during pct with excellent recovery results.