The Nytros steer harder than any other sled I've ridden. It's the nature of the beast, however there are a couple of adjustments in the suspension that can be done to lighten the steering, as Turk touched on. You can try shimming the skis also, as well as increase spring preload on the center shock.
The best solution without sacrificing suspension performance is to change out your skis for a lighter steering one. Skidoo Pilots are one, Curve skis are another. I recently changed to the Kimpex Arrows...so much easier steering, and they bite in the corners too...much better than the Skidoo Pilots. I've never tried the Curves, so I don't know how they bite in the corners, however I am very happy with the Arrows and will stick with them.
