Well I finally finished mine and flew it this past weekend. I used a Saito 72 13x6 prop and it has planty of power. It is now my favorite plane. Mods include sheeting horizontal and using 3/8 stick for the elevators, Made longer wire gear ( which im going to change to aluminum anodized green like the spinner), and left the wingtips off it.
Knife edge flat spins and hovering are no problem. with the elevator/flap mixing this thing loops as tight if not tighter than a magic does, and it will do inside or outside loops no problem.

As for the elevator down throw, just had to live with the limit as it will hit the rudder control horn if you have too much.

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