I'd say that would be the best you can do without rolling the fenders...the problem is this thing is such a pig that it's still not the best competitor out there. That said, doesn't mean that you shouldn't get the tires and stop ax'ing!
I know I won't! Ooh...the GGF event is coming up in a few weeks i think.
I went easy and fairly cheap route with a set of 18x7.5 rims ASA AR1 and 235/40/18 BFG TA KDW2 tires. I just didnt want to destroy my street setup at AX's. I wont have a chance of being competive, however at least I'll have a little more rim and more tire to tame the 3700 lb beast at AX events. I pretty much just drive the car at PCA AX events when the weather gets bad. The MS6 gets much more competitve when it rains.