Mark,
Yea, sounds like too much steering travel! Separate your nose gear channel from your rudders (mine has nose on 4 and rudders on 6) so you can dual rate you nose gear without having to cut the rudder rate. Use high rate to taxi out and line up than go to low rate for take-off. I usually switch back to high for landing. Not sure if you are using wire strut or a oleo type but have found the oleo struts help the tracking on the roo greatly.
Todd