RE: Prop selection, .91FX on Vortex
If that’s a 12X6 Master Airscrew 3 blade, go with it. It will have a bit less top speed than the right two blade, but some other fun factors can make up for it. Three blades typically pull harder in climbs, re-accelerate faster after hard turns, better air braking and not having about trimming the blades at landing is definitely a plus in your case. Think about an 11X 8 (3 blade) if your plane’s not too dirty.