I recently picked up a used five string fretless (G&L L-2500). Came essentially set up (but detuned) for low action, equipped with practically new D'Addario half rounds (extra long scale, through the body), 45-130. I had to do some tweaks to the string height on a couple strings to make sure I could get full sound at higher fret positions. The A string was particularly muted around the 9th fret position and up (it couldn't vibrate at all), and the B rattled a little against the fingerboard from the 5th on.... I raised the string height for both of those using the saddle adjustment, retuned, and all was well. Instrument sounds great. However, with more playing I've noticed the B string doesn't give a lot of "oomph" when pressed against the fingerboard. It gets worse the farther I go down the fingerboard (higher "frets"), starting becoming particularly noticeable between fifth and sixth fret position and getting worse all the way up. The note has poor sustain and minimal bass, just sounding a bit muted and tinny. When playing a fifth "fret" E on the B string, it sounds less full than the open E string. No other strings have that kind of problem. Open string, the B sounds fabulous. Full and deep. I feel like there's something simple I'm missing, but I can't figure it out. As noted above, the B is 130. Any ideas?