I think this is a really good representation of these strings. Mine are currently deader than that and I'm undecided if a new set or a soundpost adjustment would fully remedy that, but this is what they more or less sound like here...playing and dancing aside.
Cool video. I love hearing and seeing the bass presented like this. Props to the bassist and film maker.
have you tried heavily cleaning them with rubbing alcohol. with spiros id get a few more months out of them by doing that

And the strings are not the answer...