@ubnomnar what do you think
is that g string twisted? I tried my other g strings again on other basses--they were ok
the one on the fretless is wonky
Try a different gauge or a different brand G for a replacement . I've had that happen a number of times. I just poke around in my string collection until I find one that sonically fits the bill...
@kkaarrll...
1) IMHO... I think it is unlikely that a twist is the problem. Given the design of your bridge, the string ball is able to rotate a bit when the string is first installed and tightened down. A "wonky" string looks normal and can only be checked by replacing it with another "known good" string. You can check for string twist by noting the position of the ball on the G-string; then loosen the string and watch to see if the ball rotates in either direction. Alternatively, after noting the orientation of the ball on the G-string you can loosen the string and lift the string coil off the tuner post. Then watch to see which way the string coil rotates relative to the original position of the G-string ball.
2) Have you already swapped out the .045 Cobalt for another brand/gauge of "known good" string (any spare just to test)? If the same tone suck remains then it is not the Cobalt.
3) Another test is to significantly raise the G-string saddle (yes this will kill the current low G-string action but it is only a test) to see if adding break angle on the G-string saddle improves the response of the string.
4) You can also try installing the Cobalt G-string in the position of the D-string (this is another A-B test to see if the G-string saddle/break angle is a concern) to see if it improves the "dead, lifeless, thin" sound.
5) In this construction picture the G-string appears to have very little break angle over the bridge saddle (could be the angle from which the pic was taken). This would create less downward pressure on the G-string saddle which may impact tone; and at the same time with reduced downward pressure on the G-string saddle you would likely be able to push the saddle side to side as you have described.