So I've thought about something recently - traditional 19mm spacing causes my fingers to move quite a bit. If I play on a small spacing (say, 15-16mm) I get to do more with less movement. I bought a 5 string bass with 16mm spacing to practice smaller spacing and I can say it feels very cramped. But the more I play the more comfortable it feels. Yet when I go back to my 19mm bass it feels so much more free. For this reason, I plan to abandon 19mm spaced basses for a while and get used to smaller spacing that causes my fingers to move less and make muting easier. Is this a reasonable way to think about things? On a 19mm spaced 5 string bass, I have to try really hard to mute strings, while on a 16mm spaced 5 string I simply do it by sticking my thumb between the B and E strings if I am playing higher up.