Jean,
You might be able to find some NEDU reports on testing the LARV (Mk25?) scrubber on Rubicon.
Actual tables for scrubber use, would likely be in the USN Diving Manual either version 5 or 6.
Additionally, a fair number of your questions are answered by presenters during the Jan 2008 DAN Tech Conference. Specifically during the Rebreather-Workshop section.
DAN Divers Alert Network
Regards
Brad