KW,

In my experience the 55/75 GT Hunters ran out of spine at@63#@30".

With a 70# bow the arrow absorbs over 500Gs at launch.

You might want to either lower your draw weight to match your arrow to a walk-back tune or experiment with a stiffer shaft.

If your bow does hit the same vertical line at all distances the slight tail-right you get could be caused by too tight a grip on your bow.

Sorting things out should be fun. Get some rubber blunts and shoot at 100yards at a cardboard box or a bale target and see how the arrows actually fly. Take your time and use your best shooting form. Any bias in your grip, shooting form, and in your bowtune will be easy to see at this range. And your confidence in closer range shots will increase too.

Good luck hunting! >>>------------>