So there is a problem even though it worked?

Seriously though, in reference to avoiding side area interaction, I used to bow hunt quite a lot and used what I think were called "Razorbacks". They seemed to work on that principle. They were long skinny blades attached to a cylinder that freely rotated on a shaft with a point, that allowed the arrow shaft to spin at will without interference of the blades. They were the most accurate broad head I had used at the time.