Welcome to the Darkside. I'm running the same tire and have about 4 thou on mine. I love the Driveguard. The runflat will give you added piece of mind. I would consider running tire pressure monitors. I have the FOBO ones.

As for the gravel, I definitely think it helps to have the wider footprint...but if there are ruts, most car tires will tend to wander. As long as you're expecting it, it isn't too bad.