wow, I just ordered that same tire size, except for 8.5 and 9.5" rims.... an inch an a half wider in the back....

wider tires dont increase traction all that much, would have gotten far better traction if you had spent all that cash for a set of better tires (from what Ive seen nitto isnt exactly the best traction out there) in the right size. all youve likely done was increase rolling resistance.