[Tim Bishop]

Can you tell us more about your fretless bass (make, woods used, fingerboard wood, electronics, etc.)? Maybe a flat-wound string would give you what you are seeking?

For me, I use Smith Steel Taper Core Mediums and find I have all the flexibility I need through EQ (if needed) to dial-in the tone I am looking for; edgy or mellow.

More important to me would be the construction and set-up of the bass: Utilizing specific tonal woods that worked for me. Oh, and an ebony fretless fingerboard for sure. Just my personal preference for fretless or fretted, however, unplugged you can really hear what a fretless bass can bring (i.e. that certain "mwhaa" factor you might be looking for).

A good fretless is hard to find and if you are fortunate to locate "the one"; keep it!