I have little to add, but I'll mention that I agree with sbane about class being important. Richmond being appended to Marin County is as clear a no-no as can be; I can't imagine any other two places that vote the same way being more different.
Of course, I would have placed Cupertino with Saratoga and Los Altos and Palo Alto and then perhaps up to Menlo Park and thereabouts, so my opinion is to be taken with a grain of salt.
This where I have my greatest disagreement with some of the commission results. Drawing districts to group by class is as bad as drawing districts to group by political party.
I agree with you on this point.