It sounds to me as though something is binding if it spins out at top speed. Obviously I've not seen it but am willing to take a look if you pay for the airfare and accomodation.
Take the drive shafts out and see if the wheels spin freely then check out the gearbox without the motor pinion on. Just have to systematically go through and check any moving parts. I noticed that all kits seem to bind at the rear. It happens at full droop on the rear arms where the outer drive cup catches the arm. Havent noticed that it has made people spin out though.
Chris. 
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 Chris Brown.
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