I've heard great things about the 5-blades, so it sounds like you are having a good experience. Barry Lane has told me the 5 blade is the best upgrade you can do... that said, I just overhauled my Hartzell wide chords, because I like seeing 300KTAS and don't mind the vibration.
How does the Commander compare to the Meridian on noise level? I'm guessing even with the 5 blades, Commander is noisier?