I don't think you would have a problem using the 10" blade on the current auger you have.
With that said, going from a 8" auger bit to a 10" auger increases the cutting area of your blade by over 1 1/2 times. A 10" auger is actually 1.5625 times the surface area of an 8" blade - (3.14 x radius x radius).
Cutting holes with a 10" blade is hard work. I use my 10" for cutting holes really only on Cold Lake. Otherwise, too much work for the benefit.
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