I have +2mm extenders on. When you set the endpoints, make sure the suspension is compressed a little so that the steering knuckle arms don't bind on the suspension arms! It's also a good idea to dremel out some of the plastic where the knuckle arm touches at full throw! I think someone else mentioned that on this thread! You can remove a decent amount without affecting strength! If you haven't already done this, you can see where the suspension arm is getting chewed.

I use the +2's to keep the rims from rubbing on the end of the arm where the hinge pin bubble is. In the pictures you can see the black rub marks on the rim!

I can turn inside 8 T's, Mugen's, and Jammin's all day! Chris who runs my LHS, was laughing during last weeks main because I was getting everyone one the inside! I was doing it clean too! I've just started racing and this truggy has me very excited for this season. I love the building part of the hobby, and I'm always fiddling with how to make something work better. There isn't much you need to do to the HoBao to improve it! Just a few minor things.