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I'm not sure about this, but is the linear progression down to the minute, or to the second? In the latter case, that would explain things, because there's always a lag between the time of publishing and the time of voting.

There is also the possibility that we interpret wrongly this rule change. I'll ask around.

I'm quite certain the linear progression is by 3 seconds time frames. At least it uses to be. And as I didn't read anything about changing that it should be still the same.

Right! It make sense. Every block produced.