Within reason, planes usually snap better with a more forward CG. The "soft" you describe definitely sounds like the CG needs to be moved forward, farther back makes a plane snap deeper and and is much harder to control.

It's different for every plane, but I would recommend a good bit of elevator, a little bit of rudder, and a lot of aileron. To actually do the snap, nail the elevator/rudder quickly and simultaneously (if anything just a hair after) pin the aileron all the way over. Once you hit the elevator, immediately come back to about half deflection or less and keep rudder and aileron in throughout the snap. To exit, release everything back to neutral but release elevator and rudder a hair before you come out of the aileron.

I wouldn't recommend setting up a condition to do it for you, that never seems to work nearly as well. It takes a bit of time/experimenting and a lot of practice, but your snaps will be much cleaner if you do them the way I just described verse pinning your stick in the corner then releasing them all at once and hoping it ends up well.

Btw, nice lookin plane! Love those blues.