RE: Speed or air brakes
canardlover:
I suggest flapperons with elevator mixing, if your model has independent servos for ailerons.
Also, using more rudder than ailerons during final.
I do not suggest slowing the model in the air with brakes of chutes without adding lift; flaps do both things at once by increasing the camber of the wing and the drag it produces.
The elevator mixing will compensate any reaction in pitch.
Regards!