I'm shooting a very similar set up and same arrows of similar length and have been testing the blades on a few various items. The blades open easily, even on quartering angles and seem to have a large enough cutting diameter. They also penetrate very well, so I'm pleased enough to try them this season. Many people have had success with them and best of all, they fly as true as any mechanical I've seen. I'm using the 125 gr this season and can't wait for opening day.
5 Shot at
www.broadheadtests.com has a lot of good info on this head. Good luck.
Kelly