Glad i could help out! Also, I entered some of you arrow info into an FOC calculator, and your FOC was rather low, between 7-8 percent. Along with broadhead adaptor rings, you may want to also consider bumping up to a heavier head
I suggest a brass insert so you can use readily available heads like 100-125grn from any store. I use 100gr slick trick standards because of their long range accuracy. 520grns total at 70lbs, 28.5” draw, I think I could shoot a whitetail bow to stern.