I think the difference here is that the cards released in the higher series still had the same print run though the entire series, even if it was different from previous series. The SPs listed within these series were actual SPs as compared to it "bretheren". There are many sets with DP and TP that balance it out.
Release Notes is where this info would come in handier I believe. "issued in 7 series, Seriers 1 1-XXX, Series 2, etc." As mentioned in other thread,we really should make better use of this tool.
Now, about finding those high numbers, ugghhhhh. Anyone, ANYONE have 71 Clemente! I've nearly wrapped up 70-73 and have moved into the 60s and it can get painful quick....
My sins have come to face me, I can feel it
That I have lived my life in vain
And now I know I'll reap the seeds I've sown