Have you tried:
- a harder compound of tire? Like an M2 (even hard or XTR compound) Bowtie type of tire?
- Stiffer springs? Try the truggy's Blue springs. If still rolling go to the purple.
- dropping your ride height a couple of m.m.?
- heavier shock oils?
- shock pistons with smaller holes?
- making your shocks more vertical?
- moving the shock's lower mounting point to the inside holes?
- Using a higher roll-centre (lower holes on the shock tower)?
- lengthening the rear-upper arms (outermost hole on the rear hub)?
That should give you a start anyways.
That must be one high bite track! I love oodles of traction!
Oh and in case you don't have it, here's a link to the That's where I got all that info. Print that sucker off and throw 'er in with your setup tools. It will be an invaluable resource for you at the track.
Regards,
Speed Metal