Shorepower: 480 VS 100amp three phase, or 100 single

You have 2 cords out? Can you rotate them? Same dock pedestal breaker trip?
Can you reach any other service outlets?

That dock service outlet, is as good, as the last user left it, full of fried bug stuff and arc pits.

Light up a gen-set.
Marina has an issue, tell them to fix their service.

Maybe a call to Your Atlas support grope Tuesday.

Don't think you are using all three (208v) phases in the 100s.
Maybe just a single phase per cord.
Then your just getting 208v x 2 cords.

The 2 cords hopefully are sending the same (1 of the 3) phase to your boat.

I am assuming your boat is all single phase.

Please explain 35.9Kw, I'm sure I'm missing something.
Swamp logic figures 62.4Kw for all 3 phases. 20.8Kw per.

Been to this place many times, chasing a lot of the same deamons.

What's the incoming voltage when it reaches the Atlas? If the voltage is on the low side, Atlas is going to call for a ton of amps from the dock to make voltage trying to get you back up to 120v per line of output.

...also, the large capacitors in your inverter "could" be weakening, and that might exacerbate the push for more voltage as everything coming aboard is shifted to DC and then back to AC. I recently replaced all of those gigantic capacitors, and that cured a lot. I still struggle when incoming 208 drops down to 202 or 204...the contactor that the Atlas uses to handle that lower voltage range is overheating for me, I think. I've replaced most, but I think there's one lingering that needs attention.

...but your issue is at the dock, which tells me that one of the lines coming aboard is spiking in demand for make up amps as compared to low volts...

As far as the marina....all of your gadgets leading to amp draw are being matched by many others on that same transformer. Really suggests very low voltage. Incoming at 208 as a theoretical voltage is bad enough. When you find the reality is that the voltage reaching Atlas is quite a bit less than 208. It's working hard to deliver your panel 120v, and it's perhaps starting with 98-100, maybe worse.

Sadly, I have so little hands on with 3 phase.
I understand some of the theory but I know I'm still missing something.
When I really start to think about a Y transformer, I get dizzy.

I made adapters from the 5 pin 3 phase to 4 pin single phase shore power cords.
It was amazing to find what phase-leg was in use for the 50A service down the long docks and use one of the other 208v legs to ensure the nicer Vac to the customers boat.

Question; your 480v service is a whole different shore power cord always connected to the Atlas system AND the 208/100 are always connected to the Atlas system.

Or some adapters are used between the service post an the boat?

But your gens produce full line voltage. I think you have quite low incoming line voltage. Atlas covers it aboard, but at the cost of drawing many more watt/amps from the dock to create that voltage. That's why it trips at the dock...

so it’s 214 w no load, and that will quickly drop a bit with some load. Atlas is trying to get the lines to 240 and in doing so is adding load beyond your call for load to the dock.