One thing to consider when upping the tire pressures is the additional pounding transmitted to your suspension and chassis. Not an issue for race cars, but could be detrimental in the long haul on our M3Ws.
Egads! -- The pounding and vibration using normal pressures are bad enough that one feels that one's internal organs are being rearranged on the fly! I'm using 27 lbs on the front and 25-28 for the rear. For me, this is a good all around setting.
Also throw in the ever other day walk about to see what bolts have loosened or have disappeared due to vibration. I go through a lot of Loktite!
