Get as much offset and helical as your fletch tools allow. Use the amount of fletch needed to maintain stable arrow flight. I've found that an extra hour or two up front tuning bow and arrows, leads to less need for fletching surface area when things are optimal. But on a hunt with wind, adrenaline, uneven ground, and moving animals, you're right back to square one. I've used both fletches with small coc fixed heads. 76lb/30" 510gr arrows, 290ish fps. I've found four fletch with tac (2.25"), and heat, or 3 fletch with the max stealth is fine. I prefer lower profile fletch for many reasons. I can get enough offset and helical to get the arrows spinning and stable to put broadheads in similar size groups out to 80 yards, with any of those setups. I'm just starting to experiment with the tac vanes though, and like them so far.
Just remember, getting it to stabilize arrow flight with perfect conditions is one thing. Put some pressure on yourself when shooting, or shoot from an uncomfortable stance, or otherwise disrupt the ability to maintain perfect form. See how they shoot then.