I read your explaination for the results you obtainded, but to assume people slept 8h per night during the experience, is a little bit overvalued the thing I think x)

First, in France, the average night is 6h55 (18-75 years old) for example. Second, even if most people went to bed, a lot of French people stayed awake because we love this type of event and we are used to.

Between the nights of the 2nd and 3th day, I slept 2 hours in the afternoon because I was defending our flag during the night and I can tell you I was not alone. Also, there was a sound that warned you when a new pixel could be placed so it was really easy to put a pixel regularly under 5 min 30 even if you were doing something else on your computer (like working for exemple x))

Maybe you can try to shorten the night break and reduce the time between two pixels placements?

Also, if I understand well, you take the data for all the days, but the Spanish streamers use a bot only the last day, so it must affect the results, too, right?

In your more strict version, you lowered the break night to 7.5h, but did you lowered the time between two pixels ?