I find the spine on gold tips to be a bit on the weak side. Your setup appears slightly underspined to me. Drop your draw weight down to about 60 lbs and see if that helps.

If it helps and you really want to shoot at 70 lbs, then you will have to add some weight to the rear of the arrow. This may negatively affect your F.O.C., so you may find the best option is to go to 7595s.