Oh the Bowtech gang defending their beloved.
Oh the antis piling on. [&:]
Anyway, I have you as stiff to right on with that spine, but my software is older and doesn't have the 82nd in it so I had to fudge the numbers. I doubt though that you would be underspined with what I'm seeing at 60#.
I honestly don't think it's the bow as much as you are trying to steer fixed blade broadheads at 294 fps. I would try some more aggressive fletching and see if that helps you out. You know your bow is tuned fine, you know it's not your rest, and you know it's not the broadhead. So it is time to look at the arrow. You can try a stiffer arrow, but I think if you get some fletching on there with more helical things will straighten out for you.
Good luck.
Anyway, yup like he said, it's time to look at the arrow but I'd be defending a beloved so I'll stop there.
Good luck.