Offset or helical fletching will help correct an arrow's flight if it comes off the bow with problems. You can also try eliminating these flight problems by tuning your bow to a greater degree. Personally, I've never found paper tuning to be much use when trying to get broadheads flying good. I personally like to do a bare shaft tuning, followed by fine tuning at a distance of approx. 50 yards.

Other things that may need adjusting include F.O.C., arrow spine or bow draw weight. Personally, I like to try and get great broadhead flight without going to helical. After that, a slight offset is usually more than adequate.