I used to use the slap masters, back when I played a lot of slap n tap, before I switched over to roundwounds. I liked them a lot. They are not thin/clanky-sounding at all, surprisingly punchy-sounding. Wish I could tell you more, but it's been a while!

Good strings. Don't let the light gauge scare you off. (of course, a setup of your bass may be necessary, but that's to be expected)