I use the QuickSpin Speed Hunters. They are awesome! My groups are tight and my arrows are zipping right along.
One thing that might be affecting your broadhead flight is your insert...maybe your shaft too. If they are not square, you will get some wobble. An Arrow Squaring Device, A.S.D., will help a lot! If you don't have one, give it a try. Cabela's carries them.
