Looking at the graph this looks like a 3rd gear cruise and then a w/o throttle mash since there are no rpm dips to indicate a shift. (This is assuming we are seeing rpm and a single AFR trace). It looks like you go rich and then lean till you recover onto the jets, this indicates to me that you may pick something up playing with the accelerator pump cams to give a longer squirter duration. I see you use lambda rather than ratio figures too which I'm not used to either.

As a side note, I have my tunnel ram carbs set up with one to one linkages and all square jets with the power valves blanked, this seemed a more logical way of setting them up up but I'm no expert and have only just figured out how to get cleanly off the line.