How do I prevent slow movement while ski boarding on flat terrain?

This spring I tried ski boarding, and the only problem that I had was that every time I hit the bottom or section of a slope that was flat I stopped. I waxed my skis and that didn't help very much at all. There was mostly corn snow, ice and mushy snow where I was, so that may be a factor. I didn't run into any slowage while skiing with full length skis, however.