the skigym is a training device for fine-tuning edge play. (in development: size 1 1/2 X 1 1/2 ft.)
Let me break down your skiing ability into:
turning technique (edge play)
If you are already a decent skier, you probably bring enough balance and improve it further with skiing. As to the turning technique you have accumulated a lot of the " how to": drawing of radius turns from wide open to short wedel, skidding, carving, railing, cruising or staying in the fall line, adding dynamic, rhythm, flow, personality, etc.
To carry it further you may want to look at your: edgeplay.
Now, you put balance and turning together while exploring the terrain, and you not just ski but enjoy an exciting performance.