set the slipper so that you can just turn the spur gear with your thumb when the wheels are on the ground.
a quick tip to adjust the slipper "trackside" is to hold the slipper nut with a suitable spanner, and roll the car forwards to loosen it, or backwards to tighten it. (might be the other way round)
the slipper should slip for about two feet when accelerating from a standing start.
the motor movement is a problem. the best thing to to is change the motor mount screw for one with a bigger hex head, or even a slotted screw. mesh the motor to the spur gear, and then tighten it up as much as you can, plus a little bit more.
You can also fit the X11 spur gear to your X10 which will vastly improve the situation.
The shimming of the diff is nothing to do with the spur gear stripping.
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