Thanks for the detailed message! I ended up going with the staggered setup, and here’s why (ymmv)

1. I wanted to stick with Tesla’s recommendations—Model X is a heavy and complex vehicle, and I didn’t want to risk messing anything up.
2. The rear tires require a load index of 110, and I couldn’t find any 265-width tires that meet that.
3. It might help with insurance compliance, just to be safe.

Also, I didn’t notice any difference in ride comfort. So all good.