Flew my Hotspot for the first time yesterday, Awesome!!!! but I'm having problems with the airbrake programming on my 9Zap.

I am trying to mix in about 15% of up elevator when the airbrake is deployed and so far the only way I can do it is with a pmix for flap to elevator and then a second pmix flap to up aileron, does any one know of another way?

Set up is - servo in ch 6(flap) airbake mix active, elevon mix used.