My experience
I don't know Ted Williams, but am very familiar with some of how it works from my Clement e registry set.
It is a very arbitrary process. I have "lobbied" to have items added, removed as well as change their relative weight.
I was told by PSA that the weight is supposed to be tied to the value of a particular issue in a PSA 8 grade. Of course the reality is the weighting system is a complete mess and I could highlight many discrepancies with that method.
Ironically it seems they often remove (or more usually make optional) the rarest of issues where there are only a couple of graded copies - I never got a clear explanation of why.
I have found it easiest to add a similar item from a different year - for example when I started they only had I think the 1962, 1965, and 1971 Bazooka boxes - I got the rest added. They have refused to graded and add a 1956 Jay photo I have stating that it is not listed in any major price guide. They grade and include multiple other Jay and team issues that to the best of my knowledge are not in any guide.
My PSA registry set was started because I got bored looking for the handful of items I knew existed and didn't own. I try not to get too caught up in what they do and just collect and enjoy my collection the way I want to.
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