Good report! It looks like you are using the Developers FPS tool for your statistics. I recommend using a 3rd party tool, if available, preferably one that can write a log file of the collected statistics. The FPS tool is good for looking at raw numbers as they fly by but not helpful for serious comparisons which it looks like you are trying to do.
I wonder if the FPS tool “overhead” takes into account its impact on FPS. It would be helpful if ithe FPS overlay could run on a separate screen even though most of the tool output is character-based without elaborate 3D graphics.