I would guess with your setup, your arrows are too stiff. The best way to know if you're shooting the right arrow for your bow, as was mentioned, is to do bare shaft tuning. However, just to see what difference there might be, try shooting your same setup with 125 grain points, and even 145 grain points, if you can get them. Compare arrow flight with each point, and see which one has the least amount of wobble. I don't know what your brace height is, but if you haven't done any bare shaft tuning, you should set it pretty high; maybe 5/8".