If you want the plane to fly well for aerobatics, don't add any washout.

See if you can save weight. Check the wheels & landing gear to see if they can be lightened. Wheels can be a big source of unnecessary weight. CF gear could help.

Make all efforts to not use any lead for balance. Of course, the plane should be balanced well, but move components around, even if that means adding a new servo mount or reloctaing the battery. Maybe even mount a lighter battery pack.

For landing anyway, you can add reflex to the ailerons. Set up a switch for landing mode that moves both ailerons up 1/2 inch and give a little down elevator mix. This will require some flight testing at high altitude to get the setting right. You want the plane trimmed so it starts a shallow descent from slow level flight when the switch is flipped.

If you really want to be aggessive, rebuild the wings with a different airfoil.

You could also add a notch or spade to the leading edge about 2/3 out to the tip. Sometimes these gizmos can affect the airflow enough to change the stall.