It's a little grainy as I saved a Spreadsheet as a JPG but this is easier to read. You can see a few things:
1) 1958 set was going to end at 440, then they signed Stan Musial. That'st my theory at least:
http://www.thetoppsarchives.com/2010...ing-slots.html
2) From 1958-66 I think the press runs are one less than the number of series. Looks like they printed 88 extras in 1958 before adding the final series. So in 1959 they had 110 extra cards across six press runs, which presented as seven series on the checklist cards. I'd need to see a lot of uncut sheets to prove this out, it's just a theory.
UPDATE 4/13: Or you could just keep the lag at (usually) 22 cards. I should have added "possibly" in the first sentence.
3) Then there were 111 extras from 1961-66 where I think a checklist card is increasing the count by 1. Note the ratcheting down by one number per series on the differential between the likely press run and the series shown on the checklist.
4) In 1967 it looks like they ended up actually printing seven series across seven press runs. This occurred through 1970.
5) For 1971-72 it's looking like six press runs across six series.
Appreciate any thoughts or competing theories. You would need to see each sheet for each press run each year to fully check this all out.