Scott,
It might be worth looking through the archives at the forum about the bearing mods that were carried out to the early x-10's and having a chat to the owners of these cars to find out why they did the modification in the first place.....they must have done this for a good reason.
http://www.oople.com/forums/showthread.php?t=268
It may or may not provide some of the answers to the "possible" spur problems and who knows...might provide some interesting ideas for the new x-11