Red Boar,
I would go a bit stiffer than that. Everyone has their own preferance, but I like a stiff, heavy shaft. I used to shoot Gold Tip 5575 w/ weight tubes for added punch and had success w/ them the past couple years. Just recently I switched to Easton Axis shafts and have had great luck w/ their smaller diameter. They penatrate fantastic. If you have the option, I would shoot a couple different shafts and see which one flies best and which one YOU like best. Have fun and keep up posted.
Timothy