I recently made the jump to a 70 pound bow. My 2216 aluminum arrows shot straight and true at 60 pounds. And for the most part they still do. EXCEPT at longer ranges. Anything beyond 40 yards or so and they start drifting side to side up and down. These arrows are pretty much brand new and none of them are bent. I was thinking maybe it was because the spine of the arrow wasn't stiff enough. So I went on the easton arrow site and used the arrow selector..for my bow setup and poundage 2216 isnt even listed. It suggests a 2514. I would imagine it would be similar to weight as the 2216. Any ideas on what the problem could be? Or do you guys think I figured it out?