Craig, perhaps you have more bumpsteer in one front wheel than the other, resulting in a net steer left under braking, and right under power. Have you tried measuring your bump steer?
Lifted from a website:
"To measure bump steer, support the end of the car you are measuring with a jack and release the springs and shocks so the suspension moves freely. With the steering wheel locked in the centered position, measure the front and rear wheel rim offset (just like measuring for toe) at the extreme up and down positions of the suspension and compare them to the dimensions you got for the normal resting position. Any differences you note will have a steering effect on the car as the suspension moves."
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