Having done some reading on this before a lot of guys believe a 2-3 degree offset is very similar to a helical when a Blazer vane is being used. With that I ended up getting an actual helical clamp for my fletching jig because the offset never seemed to get the entire surface of the Blazer in contact with the shaft. Makes a world of difference when it comes to a fixed blade head. As far as paper tuning, I always thought that was an up close thing too.