well, can't get the sensor out, but there is a small bolt right below #2 cylinder that was happy to come out. Not sure if that hole is for all cylinders or just #2, but here is a new chart. Also rear O2 re-installed.
I guess the next thing would be to have both plugs where I can remove 1, graph it, then reinstall, then remove the other & graph it, then re-install. I didn't graph it when I had the rear installed cause I was still seeing some misfires but not like in the picture above.