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Ah, ok. I see what I've done. Totally the reverse of what you're suggesting. I added weight over the front end - in fact 4.9gms on top of the motor. so putting added weight on the front wheels.

Thanks for pointing me in the right direction. 

I had glued the motor and rear drive shaft bearing in place.

Rear wheels and tyres are pretty good, nice and concentric with a good flat tread - but I can give them a further light sanding.

Fronts do look like the stub axles pivot. Should I try to increase the amount by which they do?