Your arrow weight is just fine. I shoot near 7 gpp and love what they do to whitetails. Stiff spined arrows tend to fly fine out of compounds when you use a release. The only thing I'd do differently, would be to put on a heavier head. Your FOC on that heavy arrrow won't be very high with a 100 gr tip. When shooting broadheads, higher is better. A heavier head will weaken the spine and increase FOC. Both things that would benefit your setup.