I don't think you're going to have a lot of success with the smaller pinions, but of course have fun if thats what you want to do.

If you really want nice big maneuvers, get either the 32.5 or 33" tail booms and run the Hi Products 720mm semi blades with the stock gearing and the s/s steel muffler that MA sells.

The big blades help with blade loading. Typically the gasser is around 13-13.5 lbs, which is quite a bit for short blades.

If you make these changes, make sure the CG is still on the mainshaft or further forward. May have to use bigger battery packs to get there.