Very interesting results (especially about when fatigue started, prior to 150 strikes).

The first thing that jumped out at me was the complete lack of x3 Iron Ore with the low stats. Iron ore is, I believe, the highest rank item that you listed (since all the others are capped at x1). That leads me to suspect that there was some threshold that you hadn't met (with lowered MND) in order to even have any chance of getting x3 Iron ore. The other items are lower rank, so seems pretty clear that is based both on rank as well as stats.

The second was that with higher stats, nearly all of the x1/x2/x3 proportions were very near equal. I haven't done an analysis, but I'd hazard that the differences are statistically insignificant (that is, you couldn't disprove that the chance of each was NOT equal). That seems to lead to the conclusion that boosting up MND leads to a state where all three are equal, so you get on average each 2 (for these mining items, anyhow). Your 1.94 average per strike points that way.

The last thing is that it means that MND isn't terribly useful, at least at the present time. All of the "valuable" items are locked at 1 per strike. In the same way the King's Yield is a rather useless ability for most miners, seems that MND isn't very useful currently either ~_~.

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Thanks again for all your hard work, and posting up the results ^-^