RE: Difference in performace with 3 blade prop?
Great, I can dig out all the Rev-Up 11-7 3/4, 11-7 1/2, ....., props for it.
As far as prop load Vs. needle sensitivity, it is a large V diagram.
At the top of the V, where the prop load is light, the needle setting is very forgiving and broad. The number of "clicks" between rich and lean is great.
But as you load it down with bigger props, you drop further down the V. Until rich and lean meet at a single point.
I think some engine manufacturers now use a Y graph.