Most of the days show low harvest of less than 25ah (at 14.4v) per panel, which is pretty typical of not having the batteries run down very far, so the power not needed.
The one with the 490 watt max is suspicious as it is over 20% higher than rated, which would be unusual. Panels often do a bit better than rated, but that is a lot.
For that same day, the harvest is also very high at over 170ah, so that is over 40ah per panel. About 30ah is considered average by most people, but we have heard of harvests near 40ah per 100 watt panel at least once in the past.
You may want to check to see what the sun angle was where you were, as you may have hit the right overhead time and place. I have a spreadsheet that can be used to approximate the maximum available harvest for a day, so that also could be used to see what theoretical harvest max would be.
Any way you look at it, that was a very high output day.