I don't get a good sense of your tonal goals. What about your sound do you not like? What do you wish it had? What music are you playing? In what context? I can't see how anyone can make any meaningful recommendations without understanding that first.
Basses: P/J F'less, MMSR4 Classic, 60th Anv P, P5, Jack Casady
Amp: ShuttleMax 9.2, FearFul 15/6/1