I had the same problem with a string-through four-string. I ended up using these:
Ernie Ball, Super Long Scale* 38.25 or 38.5
I like them reasonably well and they are decently priced. Still, one night I tried to figure out what other strings might fit. Sorry that all lengths are in inches. Here's what I found based on published lengths
DR, Extra Long Scale 40.7
Fodera, Extra Long Scale 39.25
Ken Smith Extra Long 40
Rotosound, Extra Long 39
Sadowsky, Extra Long 39
Thomastik-Infeld, Super Long 39.75
*** 38” Strings:
D’Addario, Super Long
DR, Long
Elixir, Extra Long
GHS, Long Plus
Ken Smith, Long
La Bella, Extra Long
SIT,* Extra Long
Spector, Long
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But what you don't want are the strings being too long, so that the main part of the string starts wrapping round the tuner post. It's a tricky balancing act!
My bass has a very similar "problem" to BJTC's...string through, semi hollow with a two point bridge. The problem is especially on the low string (low E in my case) where the tuning post is closest to the nut.
The Ernie Balls that are on now are just about in the Goldie Locks zone. Long enough for the full sized string to sit on the nut, but short enough so that the taper begins before the post. But this was my 3rd try. My first try was with standard length strings for a 34" scale that I had hanging around the house. The second try was with a set of D'Addario Super Longs, that I bought because they said they were "super long." They were 38"...which might technically be long enough BUT these strings had silk on the ends. The taper began at 38" but the silk started a bit before that. So, the part with the silk was sitting in the nut. These were tape wound strings so I could not just cut off the silk...which is actually pretty hard to do even on a steel string.
I got the Ernie Balls because they were a little longer than the D'Addarios, and because the MFG told me they did not have silk. That's also when I compiled my list. I did not want to get fooled again by a "super long" "38". And I wanted to have an idea about about what other strings might actually be long enough for my bass.
The string MFG may help but you probably have to ask them...Where does the taper begin? Is there silk? Where does the silk begin?
Last edited by fender3x; 26-03-2020 at 11:18 PM.
I guess I'm preaching to the converted here but flat wound strings don't like being cut down but I have found rounds to be fine.
I always use rounds on my basses and because I want the heaviest they have I often have to cut 34" strings down for my 30" Yamaha bass.