2219's are thicker stiffer shafts so the only thing I can think is that when they come off the bow there is a bit oof flex in the bolts that cause them to plane up a bit. When they hit the target are all three different sizes hitting with the tail in the same position? I am going to say I would not be suprised if the 2219's land different but the other 2 end up in the same position consistantly.
In regular bow (compound, recurve) even though the shaft sizes are recomended I have found 1 or 2 that I liked the way they fly over a couple others that are spined corrrectly for my bow.

I hope this helps!

Yep they all look like they fly the same to me. Just that the heavier bolt rises. Jim