RE: Flaps or flaperons?
I had a similar problem on my Klemm-35 from graupner...it has about 2M wingspan and even though it is a low wing plane...it has a semi-symetrical airfoil that makes it float like a sailplane...so I have hard times trying to land at the correct speed.... to fast....and it won't come down...too slow and it will likely stall and have hard time trying to recover.... The ailerons are not full span..and the plane does not include flaps (real one neither)....
Someone suggested that I should try spoilerons instead of flaperons...and it was great...I just used a small upward deflection and the plane pointed the head up a little bit...a little correction and the plane loses attitude and speed quite comfortably with no vices.
Maybe you should give it a try??