I am setting up my WM Extra 60 - 90
The normal setting are:

Ailerons 20mm
Elivator 30mm
Rudder 50mm

I want to set up Flapperons to slow landing speed, I have never used flapperons or flaps before so would like some advise.
What thow should I start with ?
What direction, up or down ?
Should I also mix in some up elevator ?

Thanks