I'm not sure what ur getting at Deja,
At 200, it should be possible to generate enough lift to support the weight of the plane, either upright or inverted. Induced drag is the same, as Pyro stated. Profile drag on the wing might be higher, but how much would it affect climb? Overall drag is somewhere around 1/4 of the thrust value, profile drag is about 1/2 of that, so even if profile drag doubled for inverted flight, we're only talking about maybe a 10-15% increase in overall drag and you'd still be able to get 95-97% of the climb rate.
Climb rate = (Thrust-Drag)/mass * Velocity
Do you really wanna argue over 150 fpm? I can walk faster than that...
Daff, what airfoils are used on the planes you fly? Can you find out? I think the Citabria uses a clark-y, which is 6% camber and 12% thickness, one of the worst airfoils for inverted flight. Not saying you fly one of the those, but you can't use that as something to go by...