Another thing to keep in mind.....
Do you hear the fret buzz through the amp?
Or are you only hearing it while playing unplugged?
Opinions vary, of course. I don't give a crap about a bit of fret noise. It adds to the mix (I think positively) and makes things sound more "live".
That said, proper setup is critical. Get that action set to a good height, then set that relief!
No more posts until OP states his results! LOL (I keed, I keed)
Basses: Geddy Lee, Jaguar, Fender PB-551, American Std 5-str P, Michael Kelly Firefly into Markbass LittleMark II to Markbass Traveler 102P x 2