I appreciate all the suggestions.
I'll probably try some nickel roundwounds as some have mentioned. The GHS nickels sounded great on a fretless PJ I used to have.
EB Cobalt flats are really great but every set I've had wants to rust, it must be some kind of body chemistry thing like how some people have nickel allergies.
I agree with the person who said pressurewounds are too high tension- I found a set I took off another bass and even the first 3 strings I put on were way too tight for what I'd prefer. The 5 string set only comes in one set of gauges so I'd bet the lighter 4 string set would be great on a different bass.
DR Hi Beams are a great suggestion that I didn't consider. I've had luck with the sunbeams in the past though they are on the looser side.
I've never tried tapewounds but I'd rather not file the nut slots any wider on this bass as the brass nut was custom made along with the new fingerboard.
Asking advice aside, it sounds like you have a pretty good handle on this.
Since you’re already familiar with both Pressurewounds and Sunbeams, I’ll offer this with those points of reference in mind:
DR Pure Blues are similar to Sunbeams (round core) but are not quite as flexible or smooth and have more mids. Still more flexible and smoother than a lot of strings.
GHS Pure Nickel are also round core, very flexible and smooth and are strong in low mids. The tension is just a little higher than Sunbeams but much lower than Pressurewounds.
Two brands of nickel roundwounds I’ve also had good fretless luck with are Sfarzo and R.Cocco. Both are smaller companies and not widely distributed and both are hex core but they may be worth seeking out for a test drive.
Sfarzo aren’t nickel, exactly; they’re some funky alloy. They are very smooth but the tension is about the same as D’Addario XLs (which I think is pretty typical of hex core nickel rounds) so a little more tension than round cores. They have an even, warm tone and they seem to break in almost immediately and then last forever. They’re not very expensive but they’re hard to find.
R.Cocco are hex core also, a little more flexible than the Sfarzos and also have a very long life. They have a very even, neutral tone. I like these strings a lot but they’re a little expensive. I’ve used them for years on a custom fretless 5 that has a MM p’up near the P position and an ebony board and they’ve been nothing but great. They’re not as scooped as Sunbeams but they’re almost as smooth and they’re pretty flexible.
Just more food for thought.
Incidentally, I agree with your take on fingerboard wear and have said the same things many times here on TB. I’ve definitely seen fretless boards that were pretty chewed up by somebody but I’ve never found it to be a problem in my own experience.