I haven't looked too deeply into it, but last year I did run pop counts for this series across eBay, Deans, COMC and PSA.
Looking at the numbers I came up with I wonder whether there isn't a third level of quantities - like in the 1967 7th series with something like 5x, 3x and 2x or whatever it was. I can't see any clear breaks which would suggest that it can be divided neatly into 3 4x's and 4 3x's. It seems like a steady consistent upward slope in counts from the obvious lowest (Moeller, Cubs Rookies etc. ) to the obvious highest (O'Donoghue, Hannan, Stigman etc.).
I also saw a lot of incongruities between the numbers, particularly eBay and PSA.
You've gone through exercises like this more than I have, so I'm interested to know what your thoughts are.
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