I noticed my springs were too soft after I built mine, too. The motor torque would actually make it lean to one side! I have 6 and 7 cell NiMH SC packs that mount in the back, and that made the rear-end sag as well.
My solution was to simply stretch the springs. This puts more "pre-loading" on the shocks. If I remember correctly, I stretched my rear springs the most, so they wouldn't compress much under the batt weight and hard acceleration. The fronts I believe I stretch only a little, since they didn't have as much weight on them, and I wanted them to be a little more compliant when they hit large objects that I'm trying to drive over!
It's a free solution... just try to stretch each side evenly, and don't stretch them too much... it's pretty much impossible to "unstretch" them. Also, they might "bow" under compresion and bind on the shock (i.e. they won't compress straight, keeping their cylindrical shape). My rear shock springs do bow out a little, but they don't seem to bind.
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Paul
HPI Micro RS4 w/300 Big Block & Ball Diff
Tamiya TLT-1 w/MC330CR, 23T BB Motor, WW2 Wheels
Traxxas E-Maxx w/Hummer Body
Kyosho Mini-Z (MR-01)
Tokyo Marui 1/24 6mm Airsoft M1A2 Abrams Tank w/plastic linked treads
TT Raptor 50V2 Nitro Heli w/OS50SX-H, Futaba 9CHP RX/TX, GY401 gyro
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