I was using LaBella super steps with expose core at the bridge. And it has some pretty major problems intonating. (On a 35-inch Fretted LG-5)
The thing is, the taper core were my favorite new strings.
So not being able to use them on a Roscoe really bums me out. But I think it's just the bridge.. change the bridge and I would imagine you can use exposed score strings.
But I like stock bridge on the Roscoe too! Ha.
The thing about using exposed code strings is the feel of them, tone, and sustain.
So trying the usual D'Adarrio, or DR or other is all great, but they don't have the "feel" of the exposed core. They play themselves and (in "my" head) so far sounded better than all the other strings I've tried. (However I've mostly tried a lot of boutique strings)
I switched back to "normal" strings after using the exposed core (LaBella supersteps) and now I lost a small level of fun.
Sounds crazy right, but have you tried exposed core strings?
Now having said that, exposed core let's you bend the string more and is just easier and looser. So if you like a stiff string, then exposed core is not for you. But I'd you want the bass to play(feel) like butter, then exposed cores are for you.
So I've been debating installing a new bridge on my LG-custom, but I feel it's not worth it for me to modify my current Roscoe, as I see the future with a headless and fretless Roscoe anyway, so I won't make any changes for right now.
And I'm pretty sure they don't make headless exposed core strings.. or at least I don't know about them.
Ok just throwing that out there.
Sorry for the long post.
Keep on Roscoe'n