Try my Cactus set up;
http://www.petitrc.com/setup/schumac...cherCatSX.html
Plus the following; (from this year's Cactus)
SX2 Chassis, top plate & rear arms
Atomic carbon shock towers
12.5 degree hubs with 2.5mm of spacers for the ball stud on the hub
4mm front pivot block 10 degree
Schumacher rev light wheels
Core RC serrated nuts (they stay on like no other )
New 5mm 83t wide spur
& by the looks of things, you may want to go to a long wheel base, & maybe try the rear shock mod if its realy blown out.