How high are you wanting?! Remove both base gaskets and you end up with a .5mm squish gap. I have one base gasket and a decked case (done to level the deck due to poor half alignment, and with my Meteor piston I have a .9mm squish gap, and believe me when I tell you it has a ton of compression. Not sure where you sourced your information, but it's not right.
For the cooling side of things, I can't fault you. The P85 is powerful, but definitely suffers from poor cooling and doesn't take well to lots of wide open throttle.