Bear in mind that weight on the front bulkhead and around the servo will move the weight distribution forward and make traction relatively worse. Weight under the LiPo also moves the weight distribution forward (although not by very much, mostly it just increases the overall weight). Weight in the rear chassis triangles moves the weight back but also not by very much. The best place to put weight to gain traction is in the void behind the battery and in front of the gearbox.
Ballast is only a small part of getting the car to work. Building the car well is the most important thing, followed by the right tyres. A B4 built to kit settings should be very close to working anywhere with just a change of springs and correct slipper clutch settings.
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