The Carolina Archery Products website does reccomend flattening the biscuit but not the drastic modifications that I have seen and read about on some of the forums. A stock biscuit only loses a few feet per second and you cut that lose in half when you flatten the biscuit on the string side. Deep surgery for vane clearance may pick up the speed but will compromise the reliability of the biscuit some. I prefer to keep the reliability intact. Good luck hunting!