Is the string wound from the bottom of the tuner? That can make all the difference. And then, and only then, should you try stuff like adjusting the truss rod, etc.and...just for the record, once I have a new bass setup to where it suits me ( I do my own setups) I've never had to adjust ANYTHING, EVER.
#226 Big Cabs Club, #95 fEARful Club, #55 Danelectro Club, #144 ERB Club, #192 Peavey Amps Club. Geddy Lee J Club pending, (As soon as I get off my lazy butt and sign up.)