Moped, I use a full set of Velvet Garbos, which are pretty fat compared to steels, and a medium action of 6mm under the G. I play jazz, and also rockabilly on occasion, and can slap without any worries. I know this does'nt really answer your question, but I reckon Garbos are great strings, they're easy to slap on. If you want to keep the strings you've got, then practice, practice, practice...
