RE: 4 inch or 5 inch fletching
Hey Deputy, nice to see ya here.
Carbons through your rig with the Muzzys shouldn' t require a 5" . 4" should be plenty to stabilize it and anything bigger just slows ya down. I would try a little offset or a slight helical though, you use the drop aways, so it' s not a hassle either way. Good luck.