Its too bad that APC doesn't make more 3-blades because their airfoil shape is closest (IMO) to the actual spitfire shape.

I'm building the H9 Spit as well with a ys110FZ, i have Master Airscrew 14X7 and 14X9 three blades to try on it. MAS props look better on American warbirds IMO... but... then again.... you can't tell when the engine is running!!!