Been a while, well I gave up on 12mm hexes, stripped out the wheels from the grip the tires have and went to 17mm(m2c racing) hexes. I also ruined the idler and got a hot racing idler. For the wheels, I'm using 1/2 offset ofna 3.2'' in the duratrax tires, a pita to fit in there, but make the tire look better and more flat. The steering is turned down slightly so it doesn't rub, but I'll sacrifice that for better wheel setup. This truck is still a monster, especially when you put buggy slicks on it and do some drifting, very fun.
The deal with the wheels is that the junfac wideners are just ever so slightly smaller than the wheel hex, I may have been ok with brand new wheels and epoxy, but junfac's are meant for crawlers, not speed demons. So, it is what it is.