Finally me

Hey its the narrow runners. I'm sure they just bit through the soft snow. My Mountainsmith sled is flat bottomed. Yours might have worked better flpped over, but I think maybe the tobaggon concept or the "slippery piece of plastic as tobaggon" concept, might be better for your purposes because it has the float for powder. The Canadians use them.

Runners are great where the snow is compact as they are fast and can go in straight line. Then theres the old skis for runners idea and they come in all sizes and widths - anyway have fun with it and it sounds like you're outfitting a platoon.
Jim.