Just adding to, so if you already know this, just ignore it, just trying to help.

The cam spec you have now will have radically different ramps as you add lift. Meaning a 286 with a .4 lobe isn't hard on stuff, 286 with a .56 lobe is brutal. The ramp has to get meaner to keep that duration at higher lift.

I think you need more spring as well, especially keeping those duration numbers with more lift.