I'm not sure how much of a tip this is as you may have already done it or it could be something that everyone already does, but if you cut a small piece of 3mm Airline put it into the M3 Grub Screw hole in the nose retract unit, as you tighten the screw it creates a dampening effect on the steering which can be enough to stop the wheel veering around when accelerating, aswell as gives enough resistance on the steering to hold it straight when retracting the gear.