Not sure if this is applicable to stock tires but there is a balance between lowering tire pressure and the risk of knocking the tire off the wheel.

The stockers probably have a pretty strong sidewall, but if you get paddle tires, beadlocks are mandatory in my opinion. Found this out the hard way with a nasty rollover. Coming up out of bowl in Glamis the downhill back paddle tire rolled up the wheel and caused the RZR to flip over twice. Mind you, this was during some very aggressive driving.