mine tend to drift to the right... if left hands off for prolonged periods lol...

then again i tend to sit on the furthest right lane, and if it's rain water gradient, it does make sense i suppose.
not really a big issue to me since i run on -2.5 to -2.7 camber with about 1 degree toe in.
so for the most part my front wheels are pretty damn planted lol (drawback, really shitty turn radius lol)