OK, I think I'm understanding. In this case I had tuned DC to 50% with the breather plugged, and when I unplugged it I estimate DC went up past 80%. So, in your chart, yours is more properly tuned to start with, but when you plug the breather your DC drops quite low.

Back to an earlier question - with air cleaner and everything connected properly, isn't that still a significant source of unmetered air that you're having to tune for?