The third pass low current switch design was to lower the switch resistance from 12mΩ to around 4mΩ by replacing the 3x AO3400 FETs with a single TSM038N03PQ33 FET. I built 5 prototypes. The measured switch resistance at 1A load current was between 4.2Ω and 4.8Ω, as expected. 

All of the other measured parameters were consistent with previous measurements.