Thanks for adding the measurement charts. I have no doubt that the speaker does sound different since you changed the crossover point from about 4k to about 2k.

Having said that, I wonder how a blind test would work with a stock M22, and one with cheap Radio Shack L/Cs to adjust the XO to 2k?
2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos