Thanks for the suggestions.
I happened upon an ambient space music channel last night, and after about 6 hours of listening while writing I've got 40 or so tracks for general space background music. Still searching for more. Despite not really playing much of the game, I've found the Mass Effect soundtracks close to what I want. 80s action movie music is good but for two problems: one anything that sets a quick beat pretty much gets parsed as combat music by players and two a couple of my friends are big into synthwave as I am, so it tends to stick out like a sore thumb in the wrong setting. I've got a little bit of that for Space Combat as well.
Still need a better selection of warp travel music. While not hard to find appropriate tracks, ones that don't end up annoying the shit out of you with feedback, high pitched whines or bizarre and poorly inserted sound effects are not. I've tried Halloween spooky tracks for other gaming and eventually I tend to find them too cheesy or overt in what they do.
I'm also trying to stay away from movie soundtracks. Primarily because movie themes and songs tend to be a) really short b) quickly recognizable by some c) follow the same music format (gotta have that rising, swelling epic bit 3/4 of the way through) d) aren't so much as about ambiance as they are trying to evoke a mood. That's why I usually use video game music for table top background music. Like video games table top games need something that flavorful and thematic without being obtrusive. Video game tracks tend, though not always, to run longer and have less Hollywood like movements within the song itself. (Not strictly true, your AAA blockbuster games write their main themes and such exactly like movies do.)
Anyways, the search continues. I won't be running for a minimum of a 3 weeks or so. But do keep game and music suggestions coming. I think I'll go see what the EVE soundtrack is like.