You should be doing winny ed or eod. I would do like 50mg ed. But you could get away with 25mg ed since your doses are already so low.
And my guess is that you would need clomid. I would start it like a week and a half after last shot of primo (two weeks max). I like to load clomid at 300mg the first day, then do 100mg for ten days, then 50mg for ten more days.
he shouldn't need clomid as primo and winny do not readily shut down the HPTA. Only in high and extended doses will primo or winny cause any adverse effects to endogenous test levels.
300mg of primo plus winstrol? I don't know. And winny in doses that are beneficial will shut down HPTA. Of course for extended (after 3 or 4 weeks) of use. As of any steriod. And 300mg is pushing it for primo IMO.