Well I must be odd, I have a Ion and use a 6" auger and have no problems, actually was concerned until I fished for a while.
The only thing that can be a pain is holes freezing but the difference between hole sizes in effecting that, gets down to minutes so that really evaporates in real world fishing.
Besides you need something to do if they are not biting, and if they are the holes stay open, right?
And I have never thought " I wish i had a bigger hole".