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No matter the galaxy size, max tags per precursor is 100.
So, in a 1000 star galaxy you will have empty space even with 9 precursors, while in a 200 star galaxy you will have no holes even with only 2 precursors.

That meshes with my experience - playing singleplayer on huge I often dont get all my precursor sites until 60-100 years in, while in medium maps (when playing with my friends), I can get all the sites much faster.
 
Not cybrex, but I got the Yuht. After exploring and creating an outpost in their home system, the chain ended. No "Secrets of the Yuht", no "Further secrets of the Yuht", and no relic.

One of the precursors has a long delay before the special project for their Secrets pops up.

Probably a bug, but you should eventually get it.
 
Ok, so the current selection system is pretty much for turning off a couple of precursor that you really dislike, not for choosing the one you want. Argh.