I thought i would share this tip. Last season i got one stuck, which took an hour to dig out. Then i got another one stuck, which snapped off completely.
The problem is there is no reverse. So as you are lifting it up, the auger is spinning down. This created a death spiral for me, as the down force was greater than the upforce.
By adding jackstands, you can stop the downward travel, yet allow the auger to spin. This starts pushing the dirt up and in a couple of seconds the auger is free.
You can place the jackstands prior to drilling, or keep them in the tractorbucket and stop drilling immediately after signs it's getting stuck. Put them in postion and continue. The adjustability of the height makes it great for this purpose.