It sounds like some of the posters on this subject may not have actually tried mixing flap and aileron functions, or if they have, not experimented with it too much. Spoilerons will help kill lift if the airplane is slowed down enough. But if you increase the power and gain speed, the airplane will climb and can easily overpower the elevator. Same thing will happen as flaps, though the airplane goes down instead of up.

So when Minnflyer says:
It would be good to follow the small deflection at first advise.