A Hybrid mask was used during this period. Its large passive exhalation vent rate surely isn't the best situation. But, a FF mask was a necessary attempt by me to remedy mouth breathing and mouth venting problems.
Some people suggest that my recent change to very low event numbers likely are not reliable due to the large leak rates. I counter that with the very obvious improvements in how I feel on most mornings, and thoughout each day since making the changes to the M-series A-FLEX, the Hybrid mask and Pur-Sleep aroma therapy. I beleive the event numbers have been right. And, the quality of my sleep feels better overall -- I have more periods of nights and whole nights wherein I don't even remember sleeping.
Of course, I also have some very rough nights too.

Older charts can be found at links below:
September 2007
http://www.b419.net/cpap/sd2007.09.12.jpg ---- http://www.b419.net/cpap/NMweekly2007-0 ... -09-06.pdf
http://www.b419.net/cpap/sd2007.09.11.jpg
http://www.b419.net/cpap/sd2007.09.06.jpg
http://www.b419.net/cpap/sd2007.09.05.jpg
http://www.b419.net/cpap/sd2007.09.04.jpg
http://www.b419.net/cpap/sd2007.09.03.jpg
http://www.b419.net/cpap/sd2007.09.02.jpg
http://www.b419.net/cpap/sd2007.09.01.jpg
August 2007
http://www.b419.net/cpap/sd2007.08.31.jpg ---- http://www.b419.net/cpap/sd2007.08.25.jpg
http://www.b419.net/cpap/sd2007.08.30.jpg ---- http://www.b419.net/cpap/sd2007.08.24.jpg
http://www.b419.net/cpap/sd2007.08.29.jpg ---- http://www.b419.net/cpap/sd2007.08.21.jpg
http://www.b419.net/cpap/sd2007.08.28.jpg ---- http://www.b419.net/cpap/sd2007.08.20.jpg
http://www.b419.net/cpap/sd2007.08.27.jpg ---- http://www.b419.net/cpap/sd2007.08.14.jpg
http://www.b419.net/cpap/sd2007.08.26a.jpg ---- http://www.b419.net/cpap/sd2007.08.13.jpg
http://www.b419.net/cpap/sd2007.08.26b.jpg ---- http://www.b419.net/cpap/sd2007.08.10.jpg