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I can see it this way: you want more sol lands to have more chances to set trini/Thorn/Chalice reliably on Turn 1-2.
Oblivion Sower was great when Shardless BUG was on the rise, since it could...

I can easily see cutting 1 Karakas and 1 Urborg or both Urborgs.

What list exactly do you mean?

Granted that multiple trinispheres are redundant 3 in main seems the right number.

The best answer to Elves is Cursed Totem. It is as painful for them as Chalice on the first turn. Or you can use tools which MUD used: Masticore or Stell Helkite