| Third observation: foam doesn't fly. It just holds the motor to the | control surfaces.
Foam flies fine. What you've described has happened since long before people started making planes out of foam. As the engine/motor gets bigger and bigger, the importance of the wing goes down. Eventually, the purpose of the control surfaces and wings becomes simply something to point the engine in the right direction. :)
There's lots of gliders out there made of foam with no motor at all that fly just fine ...
Somebody else commented about flat wings, and how he modeled it in RFG2. To be fair, I wouldn't trust RFG2's for a task like that -- it's flight models are a bit simplistic (which is ok for normal flying, but once you start looking at stalls and spins and such, it starts to fall apart.) X-Plane might be better.
| Bummer. New motor; and I liked it, too. It turned a 12x6 at 5500 rpm on the | bench last night. Time to quit sulking and find that WD40...
Your motor (and plane) are probably just fine ...