You were half right.

20x10 wheels with 295/60 tires. At the moment the rear sits 1/2" further to the passenger side - I'm installing an adjustable panhard bar this week to correct it. I wanted to see how it looked after that before deciding on spacers. I've also got a set of hellwigs ordered. The front came last week (it's a beast) and the rear comes Friday. I'm excited to see how it feels after. There's definitely some body roll now and the Stabiltrack activates in sharp corners.
Probably also going to get the taillights tinted darker. I would love to figure out how to make the front LED parking lots run as DRL like the LTZ/Premier models, but haven't been able to find that yet.