A quick heads up on your engine and prop. Going up in pitch you lost some thrust, it wasn't a big change but it was a change. Your needle was too far out so when you turned it out more you fattened up/richened the engine so you lost more RPMs. Turning it in leans it and you gain rpms. You want to listen to the engine and got to the top rpm then back off/turn the needle out until you hear a drop in rpms. Someone else can tell you how to pinch test the engine.
OK, rule of thumb for prop selection and testing. A longer prop with a lower pitch will give you better thrust but a slower top speed. A smaller prop with more pitch will give you more speed but less thrust. This will give you longer run outs at take off and less vertical pull but a faster plane. We use the smaller props with a lot of pitch for racing and pattern. If you look in a tower book at the props they lable what some of the props are for, it's a good idea to look at them. A 3-D pilot runs a long prop with very little pitch.
Just food for thought.