On my 300ex at my last race I ran 3.5psi all the way around and didn't have any problem. Mud, rocks, roots, ruts, sidehilling, etc. It was a little wollowy but I am about 190 lbs so some of that is the weight.
On a fast track I run 6psi all-round and it does great. Skates around a little but runs flat to the ground.
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