Torque twist is something you are going to have to live with on a shaft drive crawler, although there are a few tricks to try and eliminate it.
It already has a harder spring as standard, so adding some spacers to stiffen it further will help but will also affect suspension movement.
Triangulating the lower links helps, as it changes the axis the axle pivots along. To do this you want to move the lower link mounting points inboard on the chassis so they are no longer parallel, ideally as close together as possible.
Getting the battery off the chassis will also help as there is then less weight being thrown about by the torque twist.
If you want to look for advice search for anything related to the Axial AX10. The Scout is more or less a clone of the AX10 so any tips or advice for the AX10 will be relevant to the Scout.
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