Yes but the
initial firmware was drawing around 550 watts at the wall, so you have an entire 300 watts grace.

Fair enough.
What does this version .98.1 cause the unit to draw?
Have you measured or are you guessing? That's all I want to know.
Edit: Another point -- the large units have more capacity (pun intended) to handle "dropouts" of a part cycle. The more expensive higher capacity units also tend to have better characteristics for filtering out spikes.
I am drawing almost 700w with 0.981
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Thank you for that info.
In which case a 1000W or better power supply is a better choice. That means that 30% of the capacity is your safety factor.
My opinion is that a 100 Watt safety factor is a bit light.
Again -- your choice people you own the equipment -- not me.