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For the purposes of backup power, don't beat yourself up over phase imbalance. If this was a PRIME application where the generator ran months and months then maybe I would worry.

Give the transformers a look and see how they are wired. A photo of the data plate with wiring diagram would be helpufl. Are they sending a single phase of 480v with a neutral (aka 277v) to create your 240/120? That would make the most sense and also be lower cost transformers since its a...

If you are determined to keep the MEP804 the simplest solution is to create a single phase critical loads panel with lights, fridge, microwave, etc on it for that "extra" phase on the generator. Run the other two phases to your main panel. My setup here at home is kinda like that with my base...