Hi Nick, do you usually offroad at Half-moon or somehwere else? I used to offroad with the stock tires with no problems, but I got stuck many times when driving up on dunes, which is normal. 11 psi is enough just to insure the tires remain intact with the wheels. When climbing a dune/hill, shift down to L or 2 and keep your foot the gas pedal. You may move the steering right and left slightly to give the front wheels better traction.
I hope this works for you
