Hmmmm
A difficult quandary and I can see you getting a lot of suggestions here, but of course it's no substitute for getting out there with your hands and ears.
Sandberg wise you will get an excellent bass no matter which one you pick, but for what you describe go for the Sandberg or Hausel pick ups not the Delano's.
Don't go G&L, quality is good, a range of neck types, and you get a full sound (I have had 3) but pick ups are on the trebley side of things.
The other simple thing is looking at changing strings, may just mellow the sound out.