I have a 6.7 hellcat and it is a beast, real early planing, non stop acceleration.
I keep up with guys on rs racings

The h2 is ultra light, good for light wind, but if you go cam, go all the way !!
I have 7.8 rs slalom which really fast and good at going through dulls/lulls (?forgot the name?).
But just don't fall with the blessed thing.....[}:)]
The hellcat is still my all time favourite, I'm looking at replacing my old 5.7 saber with the new hellcat