I may be wrong here (have been before and will be again), but:
It seems to me that if you were at 10:1 at full throttle, that you need to adjust your settings 10% LEANER, rather than richer.
I started reading all the MS threads because I'm about to get a V3 MS board and MSns_Extra setup and harness from Rodney, and I'll admit that it is as bit overwhelming to start with.
If I am wrong, please show me the error of my ways so that I can adjust my thinking and go back and reread the pertinant basics again.