I talked with Craig before I ordered my prop from him, and I directly questioned him about the performance I might expect with my engine (TMX-IO360 + EI) and his 3-blade prop.
He replied:
From the performance that you are expecting, you should easily achieve. The
360 RV-7's are getting close to 1800 feet a minute and top ends of over 210
TAS.
Short field operations usually isn't to much of a concern with the RV's as
their takeoff performance is quite good anyway, especially if your running a
360.
My reasons for going 3-blade were for smoothness and extra ground clearance. And since he is confident of my getting the performance he says I can with his 3-blade prop, that's how I went.