Here's another quick modification I did to my TR-SC10E that you may want to try as well...
The truck comes stock with 4mm nylon lock nuts for wheel nuts. These nuts do not have a flanged edge on them. Although my stock wheel nuts seamed to be working fine, I decided to change mine out for some flanged, nylocs that also have the knurling on the back. The flange should help protect the wheel a little bit and the knurling bites into the wheel to help ensure the nut doesn't come off during a race.
I had a dig through my parts bin and found the Everest Gen7 wheel nuts are flanged, have the knurling on the back AND the nylon locking inserts so the likelihood of these coming loose is pretty slim.