I was told by a very experienced ex-ag pilot with many thousands of hours in his log books that setting second stage of flap (25 deg) in the Auster when the tail was up would pop her into the air. I'm waiting for a relatively crossswind free day to give it a try.
One trick I have found useful in the Auster (which has quite effective split flaps) is that, after landing with full flap (third stage about 40 deg), it is advisable to get them retracted as soon as possible as they blank the airflow over the rudder when the tail is down. This is probably why it is inadvisable to select second stage flap when starting the take off roll.