And what about your minimum retraction height? When flying the 152, I was always taught the following. To perform a go-around apply full power and immediately remove the drag flap (30-20). Under no circumstances must you retract the flaps any further until you have reached your min retraction height (normally 300ft AAL).
That's really just technique. The airplane won't fall from the sky with flap retraction at a lower altitude. I prefer to retract them early, which puts the airplane in a better position in the event of a subsequent engine failure after the go-around.