I'd suggest that you paper tune at several different distances, like 4', 10' and 10 yards to make sure your arrow is not cutting paper at a recovery stage. I personally like to bare shaft tune. It can be time consuming but well worth the results.

One thing I do take exception to is the arrow drop from 20 to 25 yards. Man, there ain't no way to get this with a decently tuned bow. You should be lucky to see more than about an inch at 277fps. Almost imperceptable. I think the difference is showing because of the rest and the fact that the bow is not properly tuned--the rest just magnifying the errant initial launch.

I agree with Arthur to switch to feathers and try it. They will be more forgiving than vanes, and improve your FOC. Only exception I make is that if your plan to hunt with this thing later I'd fletch with 4" vanes. If for 3D and such then 3" should be plenty good enough.