Winny is a must IMO. GH is not necessary for super ripped condition. I've never used it, but, it aids in retaining muscle, not stripping off fat, diet & cardio does that. Optimal stack in the last month or so before a show IMO is:
Winny, EQ, fina or Anavar (var), test susp or anadrol, GH, clen and T3.
I used halo a couple times the month before comp and while it helped, its no miracle drug. Being lean enough early enough along with Winstrol (winny) should get you hard enough.