Is that with the automatic decay setting or with manually set lower decay values? I played a lot with MRC a year ago, and got the best results with manually adjusting filter values.
I have not yet got to the stage of doing MRC myself, so this was done by the Canadian M distributor on a paid tune up trip. I don't know what he did, but I have to assume that he did the best that could be done. It just didn't make a noticable difference in our room which coincided with M's statement that he didn't use many filters.
I appreciate that others and other rooms could be a very different story.
Aloha,