Chortdraw has it nailed that you are underspined, but since we now know that the heavier the tip the better the penetration (and more), you'd be much better off, rather than dropping point weight, to try trimming the shaft back half an inch at a time until things straighten out. But since you don't have any shaft length to spare (most shooters like an inch extra, and you have only 1/2") and are already shooting a point that's arguably too light to maximize penetration for big game, your best bet is to go up one step in spine stiffness. Although you can't tell the difference in flight and penetration, angled shots suck up accuracy, speed and momentum. Any competent archery shop will have various spined arrows you can try and a range to try them on, fletched and bareshaft. Good luck, dave