Daniel, what I was getting at earlier is that according to the planing method of bare shafting, if your bare shafts hit left of your fletched arrows, it indicates stiff. You said that your bare shafts shot right on, but with feathers hit right, so according to O.L. Adcock's planing instructions you would have a slightly stiff shaft. Paper also showed stiff. If the broadheads are heavier, that would also make those arrows tend to hit right, since they have less dynamic spine than the field point shafts.