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With my car I've verified that the 1.1kW problem does not occur when the other port is not being actively used even though the second port's J1772 is plugged into a car.

The way I intend to perform the test is to plug another car into the other port and have it be charging. Then, plug my i-MiEV in and hope it does a 'timeout' and then see if it does not go back to it's full 3kW charge level. Hopefully, it stops at 1.1kW and I'll let it sit at that level for a few minutes and then unplug the other car and see what happens. We (you) already know that unplugging the i-MiEV and plugging it back in again will give it full power.

I just need to run the test and monitor the pilot signal and car's current draw for those different combinations of actively using the other port and I hope I can duplicate your car's behavior in the first place.

As far as measuring the pilot signal ourselves, it should be fairly easy to do if you have a J1772 extension - either open up a connector or slice open the cable and attach this thing to the wiring -

https://www.tindie.com/products/nsayer/evse-tester/

For example, I don't leave home on longer trips without a J1772 extension cord in my car as when I NEED to charge I have no qualms blocking someone who ICEd me and then running the longer cord over to my car to charge.

https://www.evseadapters.com/collections/other-adapters/products/j1772-extension-cord-20-ft