I use straight now w/ an offset, left wing feathers.
Over and over...over the years, I keep hearing that if the arrow is tuned right, you don't need the helical to stabilize the shaft.
Guess I must've bought into that philosophy.
Now I'm down to 3"x7/8 A&A style 4-fletch but using more front weight (EFOC). Seems to work fine. Got away from hard helical after standing down range behind a shed and hearing the horrific noise hard helicals were making down range... quiet bow + Noisy arrows = trouble w/ game reacting. Just one more opinion...