Higbean,
Stabilization is affected far more by elevation and temperature than velocity in a given twist. The 75 A-Max is right on the bubble in a 1-9 twist, so will stabilize and shoot decently in the right environmental conditions, if pushed hard enough, but not if things aren't just right. And even if it stabilizes the BC will be lower.
It's far better to use a slightly shorter (lighter) bullet that will fully stabilize in your conditions than to try to make a marginally stabilized bullet work. Either that, or use a faster rifling twist.
