If your tires are cupped, meaning it wears on the center of the tire...
you need to put more psi on them. This happens usually with soft compound high performance tires. If the pressure is low, when the tires warm up, the tire expands and this causes the center to bulge, hence having more contact on the road surface. Now, when the car is parked, the tires cool down and the center contracts back to its original position. So it looks cupped...and you wonder if it's cupped, how did the wear occur???
Put more air pressure in the tires, that way when the rubber gets warm and expand, the higher air pressure will "hold" the shape of the tire better, thus maintaining a flatter contact with the road surface.
Manufacturer's recommended psi is probably only good for regular tires. Mine says 31 front and 35 rear...My mechanic recommends 33 front and 41 rear. It would mean a harder ride over rough surfaces.
I am still experimenting this on my new tires...so I have yet to see if my mechanic's theory is correct. Oh by the way...my last set of tires were all cupped...Yokohama AVS ES100...very soft and noisy tires...HORRIBLE!