Speedworm, I ran a similar setup to Tom's posted sheet on carpet but with 1.4 rear roll bar, 1.2 front bar, and 40wt all round. It was very fast (1/2sec sec per lap quicker than my Bx worlds, on a short track) but very difficult to drive, I think as the springing was too soft for high grip (I was using same sprngs Tom ran at the weekend at Kiddy). I was using 3200 Lipo and no weight.
Don't know if that helps (I'm nowhere near as good at setup or driving as Tom), but like I say it was quick enough! I'd just go harder to make it a little easier to drive, on high traction surfaces I have found it a compromise between soft enough at the back to cope with low weight Lipo, but not so soft it pitches too much.
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