I like, and have used both the LaBella 760FL set, and the Rotosound 77s
www.rotosound.com/bass.html#, but neither of them are dead-sounding, at least not when new. The Rotos should be in almost every shop in England.
I also tried the Jamerson set about 6 years ago, and took them off my Jack Casady bass after 3 days as I thought their high tension was going to pull the bridge off!
Have you considered using some kind of a mute near the bridge?
I don't think it would be cheating if it gives you the sound you're after.
Good luck.
Mike