I went through and rebalanced all of my props, blades and hub. I decided to re-run them on the engine and see what it felt like turning today.

71°F / 42% humidity
5/20 fuel, MC59 plug, APC sport props, stock Mag V carb w/ spraybar "straight in".
12x7 - 2100 lowest idle rpm / 12,810rpm
13x6 - 1950rpm / 12,700rpm
13x7 - 2000rpm / 12,330rpm
13x8 - 1890rpm / 11,300rpm

Much less vibration than the last time it ran and the throttle transition is superb.