Low skid/high skid? From what I can recall, the high skid Squirrel puts the airframe spot on the top of the ground cushion, just before the skids touch (depending on weight, power, etc), whereas the low skid is through the downwash and stable before the skids touch. The Squirrel dance is basically trying to get on the ground whilst the ground cushion has other ideas: that was my excuse for the erratic landings, Guv!