I only shoot one arrow at a time...Years ago, I would shoot field points and would shoot 30-45 minutes a day...That's good for getting your back in shape but can be detrimental for your form...I found that I can go out and shoot one arrow, with broadheads, shoot a dozen times throughout the year and I'm good to go...

I shoot 64-65 pounds, a few years ago I pulled my back so I dropped down to 58 pounds and killed 3 deer with all pass throughs...You may simply be pulling too much weight and wearing yourself out...It's better to shoot a few arrows and do it right than shoot too much with poor form...

I'd drop your pull down to 60 pounds, shoot 12-15 arrows a session for 2 weeks, then move up to 64-65 pounds, shoot that for a couple of weeks and go hunting...

You only get one shot, make it count...

For what it's worth, when I shot a Bear Whitetail it was set at 55 pounds and I killed a bunch of deer with it over a 20 year period...Today's bows are much faster than what I was using back then...As a matter of fact, other than having 4 pins than now 2, I could still kill deer with that Whitetail...