I just bought Prince Warriors and am really impressed with how comfortable full poly is in them. So, I'm trying a few polys. I came from a gut/poly combo in the EXO3 Tour. I went down right now to 48/46 in tension and may go a little lower. The best advice I can give you is with fully poly, thin gauge and lower your tension.
BTW - IMO, gut in the crosses is a waste of gut.
Wilson Steam 99S poly Luxilon 4G 1.25 @ 45