Glad to hear you are loving your 427R!!!
I have recently been bitten by the tire wear issue as well. Here's the most recent thread that I resurrected when I discovered the uneven wear pattern. There are some great links on page 4 to camber bolts, etc. My bolts should be here any day now and I will update this ongoing thread with any additional info:
Tire Wear
Definitely keep an eye on your tires if you take no action at this time.
Kandy