Cabo shaft zincs

Sweet and clean.

A thought;
Your water injection to the shaft log seal assembly, that street 90 and nipple, Is that brass or bronze?
Maybe something to ad (to the bottom of your work list) to check them out.

Do you mean the ones in the above photos, or are those different from what Cabo used originally?
If the former, based on what I can see I wouldn't waste any money for re-sealing them.

Unless you know a trick, those seals must have the shaft / coupler separated to replace that seal.

I never suggested Tides Marine seals, mostly because they are lip seals - as well as these Chatfield things are.
In principle, I prefer face seals, like the PSS that the OP is planning to fit.
Or, for life lasting, 100% rubberless stuff, the Fluiten seals.
Though these are only available in large-ish sizes, possibly not down to the OP shafts size, IDK.
And pretty sure you can't buy them for $500 a piece, anyway!

Anyway, it would indeed be remarkable if such seal withstood overheating with no leaks, but I don't think it did.
In this other recent thread, the OP said that the overheated one is indeed leaking under way.

As an aside, it's interesting to see on the very same Chatfield website that they also produce what they call "zinc spinners", which are almost identical to the zincs that I previously suggested - as opposed to the traditional shaft zincs with their drawbacks.
But we've done that to death by now.