I know what you mean. I had to think long and hard before selling my old King. In the end, the guy offered me more than it was worth to me. I used the money and bought a great Czech beater bass and an Italian carved bass from the 50’s that I use for less tempestuous shows.
I think its all in the player as to what kind of tone and intonation develop. I was using Spirocores, with some occasional experimentation with Hellicores (which I didn’t like) and weed whackers (which didn’t work for all the things I wanted to do). I do a fair amount of bowing so I’ve been sticking with steels. That said, I started using Pirastro’s Evah Pirazzi strings. These things are excellent (for me). If you have a chance to try a set of these give them a run. Great tone and an awesome feel. I was surprised by how well and rich they sounded when slapping.