Woody,
Be very careful using that much leverage to break skis loose. As one person noted, it sure helps to put something under the skis to keep them from sticking down. In a real pinch, use a trash bag over the tip of each ski, then taxi forward a bit.
Pushing or pulling sideways on the tail puts a huge amount of torque on your ski axles, which by the way, are the weak link in a cessna's landing gear. It doesn't take much to start a fracture there, and after that, you're looking at a wreck.
On Aero Skis, I remove the center "wear strip" (some people call it a skeg, but a "wear strip" is designed to be replaced, neh?) and replace it with a comparable size strip of either 1/4 inch or 3/8 if you can get it UHMW. You can use the same flat head machine screws to attach this plastic strip. This gives you great directional control, PLUS there just isn't much on the bottom of the ski to stick down now.
With skis thus equipped, I generally just walk up to each ski just prior to boarding, and give it a gentle kick to the toe of the ski--just enough to move the ski sideways a tiny bit. This shearing force is plenty to shear the frost off the bottoms.
As is, your metal wear strips just sit down there and gather frost, and will stick you down bad if not propped up.
Lose the rope--I can guarantee sooner or later, you or someone trying to help will do some damage with it.
Take care,
MTV