In addition to what Gavin and Derek said I think it is also important
to know that the location of your Centre of Gravity has a significant
influence on the winch launch characterisitics of the Standard Cirrus.
Make sure it is no-where near the rear end of the allowable range. I
can't remember the figures but recall having it close to mid-range and
always felt comfortable.
To prevent sliding into the baggage compartment I always took the
pedals right back and trapped myself between pedals and rear canopy
rim during winch launch.

Marcel Dünner