Make sure the skis are properly aligned with the LG - not angled slightly or "wobbley" on the axle.

Also check the bottom of the skis. Many of them have a small "keel" extending down about 1/8" or an indent extending up to provide better lateral control on snow. When I used to fly in the winter I had steering problems with perfectly flat bottom skis, when I changed to the keel/indent type the steering problems were, for the most part, gone.

Hope this is some help.