I was up late last night and installed the Matchbox.
I'm happy to report that I have matched elevators in the center and at both end points. It works perfectly on both Low and High rates.
I'm going to fly the plane this morning and see how it performs. I did a couple walls and a few waterfalls yesterday evening after work. That was with the elevators still mixed in the TX and not perfectly matched at the end points. It's hard to tell the elevators weren't matched perfect when your doing such violent maneuvers. But, while doing IMAC type flying, I could TOTALLY tell that it was corkscrewing off in one direction.
I'll report back after a day of flying.