Cold temp make any tire tough to hook at my power level.........can see yours being worse
I ran my MTs at 35psi hot on the road
I run the below on the back of my 97' with 18 x 12 HRE's for full time street duty, sticky tire and meant for carving
You can always tub it and stuff a 345 in there but a 335 will give the same traction
