Rob, as has been said, it is more to do with the setup and driving etc than the machine itself. Darren did indeed kick butt a couple of weeks ago now, but to be fair, with his talent he probably woudl with a shoe box on wheels, BUT, 2nd that night was Freddie who is just an "average joe" (I am sure he wont mind me calling him that when compared to Bloomy) and his car looked just as good as Darrens.
One HUGE help for you would be to either set up correctly or change the make of the "on/off" switch you appear to use as a speed controller.....
But to emphasise how much it is not the car and that they ALL are more than capabale of being competive, Kev H, dominated this week and four weeks back (with an X6 Squared), Freddie (22) looked great 2 weeks back, Graham Eldridge and Mike Wright (both with RB6's) have done the same in previous weeks too all with different chassis......