[CMOTD]

Bearing in mind that mine run on a wooden track, I have never found the need to add any weight. They handle just fine without. There is a slight tendency to lift the nose a bit under hard acceleration, although never enough for the braids to lose contact or de-slot, so a bit of weight near the front end might be advantageous.

One thing I have found is that they do handle better at 12v than my usual 13.8v, the motor is a bit peaky and the lower voltage just tames it down a bit and makes them more predictable round the twisty bits.