You can use the original flap set up without the spoiler bit added. You will need to mix down elevator with flap if you do this. (Mine pitches up even with the spoiler bit added). Without flaps it lands fast, even with the tail dragging before the mains touch and mine is light (6.75lb). There is no problem with the wing section, the flapped area just changes camber and adds drag, which this model really does need. Slow flight with flaps down is very stable and needs just a trickle of power to maintain height. If you need to go around, open the throttle slowly and add just a little power, if you bang the throttle open the nose will pitch up real steeply. The anhedral tailplane has no detectable differences from a straight tail, but it does look neat. What I find is that the model does need to be very deliberately flown, but responds like a arrow when you do, i.e. it goes exactly where you point it, whether you meant it or not. Once trimmed you will enjoy the thing.
Evan.