As always, this is some very nice work, Jeff! This should really prove useful to many of us, and the mods you outline are pretty easily attainable by most of us.
I do have a couple of questions, though. I'm a little confused as to how both the pressure drop and the flow changed between the two examples above. I would have expected to have seen one of the two held constant from run to run. Maybe I'm missing something - like maybe the two pressure references that you show are somewhere other than the inlet and outlet?
Assuming that I'm just missing something, I think if you dial back the flow to match between the two runs, you'll find that the pressure drop is actually less for the tanks with the dividers, since the flow increased by a larger amount than the pressure drop did.