How about a multi-pitch prop like Zinger's 13x6-10 or 14x6-10 wood prop? I used the 13x6-10 on my 4Star60 with a Saito 91 ringed motor. The response to advancing the throttle from idle (or low speed) to mid throttle was great. The plane would literally jump forward. In comparison, I used a 13x7 (after I broke the 13x6-10) and the response to the same throttle change just spun the engine up in rpm with very little initial forward thrust. I was so accustomed to the initial "pop" that when flying the 13x7 I was caught by swirling winds that hit me from behind during a slow flyby - I hit the throttle but there was zero response and it resulted in 3 point drop from 5 feet. In similar flying conditions the 13x6-10 gave the plane enough forward motion to keep flying.

Just another option (way too many ) ...

When I build my Hog Bipe I will use the multi-pitch.