Here's some charted data I've gathered over the duration of this project:

Cell no.9:

and Fuel Cell no.10:

You'll notice a change on the 2nd when I hooked up the warm water circulator for no.10.  No.9 also appears to be picking up some ambient heat due to proximity.  Additionally I rearranged the meters and adjusted the wires on 9/30 and saw a huge improvement in performance from cell no.9 that is visible in the graphs.