The only time I had a car do this is when the chassis was broken, it was a small break though and hardly noticeable. This allowed the car to twist under ful power. I'm sure you would have noticed if the chassis was broken, but make sure all the screws are in properly on the bottom of the car, also is the top deck fixed properly? if this is not right it will twist the chassis. I think your car is twisted or twisting under full chat.
Good luck, PM me if you cant fix it, I'll give you £40 for it ;-)
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