IMO those arrows are way underspined for your draw wt. The spine on those arrows I believe is about .500. True your arrow length is short but I still think you're too weak. Were you shooting tight groups with these arrows/bow before the "incident"?
Tell you what, I have a dozen of Easton Epic STs 400 with Quick Spin vanes (1/2 doz that I have not shot yet and 1/2 doz that I had used for practice) that are cut to 28". If you send me a pm - I will give you a good deal on them.

Brace height? What was the brace height on your old bow. It could be your problem.

Try shooting less poundage. I am not a big fan of those hostage rests either.

I agree with Choppers, a quick way to tell if its your arrows is to give each limb bolt 2-3 turns and shoot less weight. If the arrows fly better then theres your problem.