I'm using SilverSlaps EA and Superior Bassworks (SBW) Deluxe "Dirty Gut" medium DG. It's an excellent mix for feel (including texture, gauge and tension), playability and sound. I play ~45% slap, ~45% pizz, ~10% arco, ~70% acoustic, ~30% amped.
I started out using a full SBW Deluxe "Dirty Gut" medium set but found the EA just were too quiet acoustically, although they sound great amped. While I've switched out the EA, I've continued using the same SBW medium DG, so have had them on the bass for about 18 months now and they are still going strong. These are basically spiral-cut kevlar-core wackers that feel nice and thick with excellent texture, and look very much like gut. The SBW DG are relatively low tension (although only slightly lower than the SilverSlaps) but have very good volume and play very well for both piz/slap and arco.
I went to SilverSlaps EA mostly for better acoustic low note volume and clarity, but love their tone too; the growl cuts through nicely. They work equally well amped. I'm not sure how old yours are, but I've been using the SliverSlaps for a year now and while they're well broken in, they're showing no signs of wear. Break-in took 2 to 3 weeks; arco really speeds up that break-in process but for me arco also required generous rosin, a tight bow and some slight technique changes to get them bowing well.
I'd suggest trying a similar mix if you're not pleased with the full SilverSlaps set. There are lots of string options once you break away from a full set. I'm pretty sure I'll try gut DG sometime in the next few years, but my currrent thinking is I'll keep using SilverSlaps EA on into the future.
If it's any help,
here's a recording of these strings on my bass (Alcoa).
