I agree, prop is not the best, weight is another handicap. 22x10 is a good size for prop, but scimitars are for WWI bipes as far as I'm concerned. Aerobatic performance with the G62 begins to suffer over 18 pounds. A warbird doesn't need to do IMAC maneuvers, but it should at least be able to climb at something like scale speed. One of sinergy's recommendations should spin at least 7000 rpm, which would make a big difference for you.