Only having used the Micnelin PS2's and now my Vredesteins in 235/40-18 and 275/30-19, I think you will find that tire pressures 40 and above will be too high -- rough ride, tramlining, and center wear. I only go to 40 on the track!!!

Try 36 all around -- decent ride, good grip, and the extra 1 or 2 psi to the front help take out some of the understeer.