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I have a Supra with staggered wheels - 8's in the front and 9's in the back. It is critical that you watch the pressure and keep it where it is supposed to be. Also critical is to be sure that front and REAR alignment is to factory specs. BUT...I had mine aligned at Toyota and still was wearing the inside edges of the rear tires. I found someoneat a tire store to tweak the alignment slightly to bring the outside in a little more and now they are wearing as close to perfect as possible. Talk to a good tire dealer and have him guide you.
Since we can't rotate staggered tires, every 5,000 miles I have my tires dismounted and re-mounted on the opposing wheel, facing the same direction to maintain the correct directional tread. Works like a charm, and increases my tread life big time.
You still do this with your new shoes ? I don't have a lot of faith in the tire guys, especially since we're talking about 18" alloys, low profile hi-perf tires with tpms - the less they touch the rims/tires, the less damage you'll incurr. Even if it extends tire wear by 20%, it's just not worth the extra cost, time & hassles IMHO. . . (besides the sooner I wear out my OEMs, the sooner I can get into a set of PS2s or Potenza PPs )
^I don't go to Discount Tire or some crappy shop. My guy is an absolute all-star. he knows good wheels when he sees them, and I get the white glove treatment.