hey, I have the exact same bass / problem... probably amplified a bit with the tone I get on the DR black beauties too tho...
heres what I have done to combat it... (ok I bought a new bass as well but shhh) to get the best tone I could out of the stock rbx375 I set the pickups to middle, the bass to 1/4 boosted off centre and the treble boosted just a tiny bit off centre,... I dont overly like it but its the best I could do to get slapping and finger tone nice on the same setting... I love my bass for a rock tone it sounds freaking awesome... but for slapping im not liking it

my teacher thinks it sounds good in a weird way, more of a dark grungy tone than the usual bright and punchy stuff you hear ala flea tone... its semi growing on me the way that this bass has such a dark tone, still hoping the new bass is more versatile for slap stuff though!
good luck with it!
