I've always thought that Gibson basses sounded muddy. Always. Never saw the attraction to that sound with the possible exception of reggae.
BUT, something weird happened. I bought a new cheapie Epi EBO for a specific purpose. It came with rounds that I was going to change to flats. Got it home, started messing with it, and damned if it didn't have that 'piano bass' sound that I had looked so hard for when I was younger. Let me tell you, nobody was more surprised than me.
I had an Epiphone EB-0 ; loved the look, couldn't stand the tone. It was also pretty fragile.
What kind of strings, and round,flat, or in-between?
I had a 2000 Gibson Blackbird (the Nikki Sixx T-bird) with the TB+ pickups. It sounded great, but it was wired both pickups to a killswitch->output, no volume or tone pots