Helical adds drag to the back of the arrow allowing it to stabilize quicker, but also slows the arrow quicker. I shoot a couple of degrees of offset with my broadheads. You need to take the time to tune your broadheads. Spin test them, make sure the spine is correct for the poundage you are shooting. Its all a matter of attention to detail. Tune the arrows and the bow, then tune the bow to the arrows, its a system. My son shoots Magnus two blades with straight fletch just fine through a recurve.