Well, way back when I first started to find out about slapping /tapping etc. I had similar problems.
My first proper bass was my washburn status( a very bright, active bass with graphite neck).
Around the same time I used to go to various music fairs (wembley/novotel etc.)
As headless strings were more expensive back then(1989/90),I used to get a few cheap sets
of Trace Elliot strings.
Anyway, after my attempts at slapping(I was eager then-don't bother with it now),
I found that the brightness used to go after a couple of hours&I changed them too frequently really in hindsight.
I should have left them on,as in my opinion Bass is bass .
It's not really supposed to be a twangy instrument is it? (may have started something off here)
It didn't take me(too) long to adapt back to the original bass sound I prefer before I attempted all that slapping.
Nowadays ,I leave my strings on as long as I can.(If I was/will be gigging regularly I would change more frequent)
One other thing for any users of the washburn Status: the electrics in the bass packed up o ver time
and the bass is now passive &the band prefer the modification.
In a roundabout way, hope this helps