No problems with slush, just rev it a little after breaking through and cleans it out well....When hole hopping I drill 20-30 holes and fish them as I drilled them only carry a scooper if the holes are icing back over....
This is exactly how it should be done.... any hole can be made slush free with any power auger if you drill it out correctly.
As you are breaking out at the bottom of the hole... give it a rev right before you remove the auger from the hole. The extra rpms will flush out the slush.. but you will need to make sure you have waterproof boots on.
I don't even carry a scooper anymore with me as I am drilling.