I wouldn't go too hot on the setup. Mine should be running around 33mph the way they're setup and anything more than that would pretty much keep you on your lid. It's got a pretty high CG and we did our fair share of barrel rolls just trying to make turns with them.
Nice video! How do you like it compared to an ordinary Rustler? I have got a spare motor, so I am sort of on the lookout for another rc to put it in...
How does the Rustler and Slash compare when driven on sand? I can only assume that the Rustler would be better because of the wider tires.... Send me a PM about how much you want for your VXL Rustler.