Here's a tip from IceShanty..
If you have a dremel, here is how you can make your auger razor sharp.
Get some chrome polish (I use simichrome I think it's called) and put some of that on a small fabric buffing wheel.
Then use your dremel and the buffing wheel should turn so that it is turning away from the auger blade.
Simply run this off and along the top of the auger blade (only do the top side, NOT the bottom as you don't want to alter the cutting angle any) This will make your blades razor sharp.
I have a cheap mora 8 inch hand auger and it just rips through the ice.
I've used other augers with brand new blades and nothing comes close to this.
I just use the polish to take the oxidation off of the blades every other trip or so.
If your blades are already dull, it might be best to start with a new set and then do this as maintenance.