I have two p225 tires on front, two p235 tires on rear. I have all four currently at about 30 psi. Could or (should?) I put JUST the rear tires at say 35 psi while leaving the front at 30? I have a drop on just the front, not the rear. I figured since it's RWD the back being up a bit would help the car move along better while keeping the front softer for the drop. Or maybe I'm nuts.