I've always liked stiff primarys with as much swists as possable.
More poundage the bow (quicker the arrow),big head, less center shot the bow. the higher,stiffed your feathers and the more swist needed for your arrow to recover quicker when flexing around the bow.
I JUST LIKE TO SEE THE ARROW SWIST DOWN RANGE INTO THE BUCK.
Even with straight fleching jig the feather has a R,L natural swist and will swist that way.