Fuzzy-I built that darn-car-just ask me!!!
Just make sure when you tweak it that you turn both tweak screws even amounts-so if you turn one clockwise 1/8 turn-turn the other one 1/8th counterclockwise.
This is because you set the tweak screws to just barely contact the chassis so this way you maintane that contact.
Also- first or after resetting tweak-always tap the car on top of the servo or the top of the center shock to reset the suspension.
Ray