I like your launch conditions (save spin).

You could likely drop another degree in loft without changing your swing - it'll bring down your sping 500 rpm as well.

Also, the ProV1x is more the ball over the ProV1.

The other issue is that a 'cut swing' produces more spin than a 'draw swing'.

Finally, as per Trackman research, angle of attack (hitting down or hitting up) doesn't appreciably effect spin - just launch angle.