funny you ask this, when i went rididng last saturday with LOOSENUTZ i had my razr2 at about 10lbs, i didnt know this cuz the idiot who mounted them had them aired up like this but after i looped the quad up a bullshit hiil, i was amazed and LOOSENUTZ recommended i check the air in the tires , i ended up airing down to 2 lbs and they hooked up really good, better than ever!!!! and i climbd the hill with out spinning at all!!!!!
Here's a link to ITP's suggested tire pressures for different tire sizes. I'd compare your set-up to the XCT's... This pressure seams a bit high, but I've been running it on mine with 8 psi in the front 23x7x10's and 7 psi in the rear 22x11x9's.
One thing I've noticed is that this higher pressure works great for high speed desert type trails, but when you get into rocky trails with roots and other lumps/bumps that it's better to air the rears down to 4.5 to 5 psi (for better traction and a more comfortable ride), but I keep my fronts up at around 7 or 8 psi for better steering.