Moving the flaperons "up" will kill some lift in the wing but this isn't what you are trying to do.
Moving the flaperons "down" will add wing lift and this is NOT what you are trying to do.

What you are trying to do is PRESS the tail down for 2 reasons.
1. Makes it easier to steer via the wheel
2. Reduces noseover tendency.
This is done best with the elevator deflecting prop wash. Don't "cheat" and use trim for this either. Not enough to do the job and you may forget to remove it before takeoff.