I seem to be having some issues with my new arrows. They aren't groupingas well as my other arrows.I was a little worried about the arrows being too stiff. So what would I expect to happen if the new arrows areoverspined?

I shoot a 07' Tribute at 70lbs and 27.5'' smooth mods (got speed mods on the way)

Old arrows are HunterXT 5575's. 26.25'' at 358gr toal weight

New arrows areHunter Pro's 7595 26.50'' at 440gr total weight.