rockbass humbucker ?

[b assingear]

Ive got a rockbass streamer that plays very nicely . better than many of the real Warwicks I have used , but the active pups just dont seem to have a happy medium -- all bottom or all top . Ive tried running them passive and its better but still not right .
I was thinking of using a passive humbucker (which Ive been happy with on other basses) . just wondered if anybody else had tried this before I start chewing holes and what the outcome was ? . Or has anybody found a good replacement for the split neck pup that would fit ?