ORIGINAL: Flypaper 2
--- Now throttle back you will have to gradually back off on the up el. till it slows down enough to the point where el. is at neutral.
You mean back off on the DOWN elevator as you slow down.
You are correct that a bit of "up" elevator will eventually be needed to flare, however, not as much up as you would if the flapperons were not deployed. These are flapperons -- not flaps -- they are (or should be) only deployed at a shallow angle -- not like true flaps in landing configuration.
This is a simple case of over-compensation -- the mixed-in down elevator trim is excessive.
Shoe's comments about the relative effectiveness & associated risks of using flapperons are right on the money.