Well, bad news. Parallel doesn't work on this latest firmware. Well, it does function and share the load, but the "reporting" is all done from the master, unlike the previous versions which kept settings separate.
What this means is that on the old version, you can set things like charge voltage, current, etc independently. When they switched to the new firmware, they "simplified" things and locked the settings of the slave, and everything is controlled by the master, which is nice so you only have to make changes on one inverter.
The problem, however, is that the master is still only reporting 8k capacity and 8k load percentages. Due to crappy weather, I haven't really loaded the system so that I didn't drain batteries too deeply. Well today the weather is perfect, not a cloud in the sky, over 10K of generation so far this morning. I plugged in the car and saw the load spike to over 100%. Strange I thought. Then everything shut off. I reset the inverter, checked again, same problem.
The inverters are sharing the load, but the master is turning everything off once 8k total output is reached. FAIL. Back to old reliable firmware