uneven pickup volume

I have a peavey cirrus. I love it, i bought it second hand from a bass collector online. In my mind Cirrus have that zing or modern hi-fi tone, but once i played mine i don't find any like that. I use a Foundations Strings 45-125, kinda old honestly but when i change the strings for the first...

I bought a fretless-conversion Japanese jazz bass from 1999-2002. I have Labella 760FL on it and the G and E are substantially louder than the A + D. I tried lowering and raising the various combinations of pickups or saddles, and cannot get an even volume without sacrificing buzzing or high...