Most likely underspined. The newer, hard, one-cam bows like a stiffer spine than what the charts usually call for. This is a common problem. I think it is a result of the charts not being updated to keep up with the newer, faster bows.

Go to a stiffer shaft, decrease point weight or turn the bow down to around 60 lbs.

As a side note, those 2412's will disintegrate if you look at them hard and do not make a good hunting shaft. I personally would not use anything less than a 15 wall thickness for hunting. If you want light, go with a good carbon hunting shaft but you will still need to stay on the stiffer end of the spine range.