Cut a couple of 1/4" X 2" shims out of a pop can and shim the blades to cut more, not less. Never use a file to sharpen auger blades - they must be razor sharp, not sharp like an axe. There is a shop on Bowness Road in Calgary that specializes in carbide blades but can do a really fine job on ice auger blades for about $20. They do my 10" blades at the end of every season because of the grit/dust in the ice on prairie reservoirs.
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