All car with the spool will experience the same vibration when you are bench testing the car while turning. Nothing you can do about it, it is simply because the plastic wheel/tire are never balanced left and right(or never will). You can try to balance a toy car wheel/tires but again, it will never balanced perfectly like a real car does with the computer equipment....

If your front wheels are perfectly balanced (or very close across left to right), while running spool, it will not vibrate, or at least it will vibrate very little....however, if you are racing your car on the track (with load) those vibration will not occur compare to you bench testing the car without load. I mean, how can you tell the front wheel is vibrating while running 35 mph on the track?

1 other thing you can do is limit the total steering range (full left or full right)...go like 95% only, not full turn....that will also extend the life of the CVD up front.

Those double jointed CVD that posted above might help a little, but $60 a pop and probably will last you 2-3 races...is alittle bit expensive for me (we have a box full of those broken CVD from the Xray owners and Corally drivers that tried to convert it to work on their PHi). Remember...it is the era of TEKIN 203 with 13.5 motor that can run as fast as MOD motor...with those kinda power, not too many parts can last with impact.