Also along with a good setup, you may need to check your technique. I got this from "101 Bass Tips from the Pros" (GREAT book). Do this with each finger too. Put your hand down on the fretboard and play a note. While the note is ringing, lightly lift your finger up until you get a buzz. Right before you get that buzz is all the pressure you need to play the note. Its surprising how little pressure is needed. I do it as a little warmup reminder before I play now to relearn my fingers, but Im playing lighter by the day and saving energy. Try that.