Slush can always be an issue for us as well.
We have a small lake in our area that my boy puts his spear house on. That one is surrounded by heavy pine timber and rolling hills. The blowing snow tends to just drop into these little lakes that are sheltered like that. It's more prone to slush problems because first off it gets insulated with a blanket of snow before good ice can form. secondly the snow just keeps piling on, the weight pushes the ice down and the water soaks up through cracks in the ice. It all looks perfectly harmless and beautiful at a glance. Until you take off across the top of it on snowmobile with a small ice fishing house in tow.
Then you realize it's winter's quicksand. Only worse, because when you get stuck, you have to get that stuff out before it locks in (freezes)
It can be simply horrible.
Lake of the woods is where we do most of our ice fishing. The American side of LOTW is a mud bowl, shapeless shoreline surrounded by swamp/cat tails.
And it's a huge lake, the wind really kicks up and it can be miserable out there but it blows pretty clean as far as measurable accumulation. You can get into slush pockets if you are out blazing your own trail on LOTW, but it is much lesser of a problem than I have seen on smaller sheltered lakes.
