now that I read the whole thing, never use Traxxas fuel, if you don't do the after-run oil on your filter, it could rust over time since nitromethane is known to pull moisture, and don't run on 33%, it's like running a 3s battery on a car for a beginner, always run nitro on 20% (2s) it's a safe...
If the engine is new, it has to go thru a break-in period, make sure all the bolts are tight as much as you can, make sure all exhaust mounts are secure, and maybe send pictures of where the weak points are. I own a T-Maxx for a year, and I know some weak spots of Traxxas nitros.