Been slapping for years and have really toned it down as to where I rarely do anymore. Still love to whip it out now and then. I kind of "invented" some of my own techniques that a lot of killer gospel and funk guys would always ask me to show them. Most are speed slaps based on double, triple and quad thumps. I learned to slap pre-internet so I had a couple books and basically had to use my ears to learn. It helped me develop my own style. I will say that the left hand makes a huge part of slapping. The way you mute is super key. I learned Higher Ground and basically every flea part from a copy of bass player and just wearing out my cassettes. All I had was a Pbass copy with high action and no web forum to tell me to buy a better bass..lol. I think this really helped me with the double and triple thumps. I could play all the RHCP licks by the time I was 16 and so I progressed to fusion by taping BET jazz and copying Marcus Miller and all the guys on there. If you are new to bass or new to slap, I would not alter a bass so it slaps well but hinders other play styles. If you want to be a hired gun or session guy, you will want to be super versatile so set your bass up that way. I still have low action and 45-100 (130 B) because I like to vibrato and bend strings easily. If you are in a rock band I'd forgo any slap setup and consider a thicker string gauge for better tone that can handle a drop tuning. My point is that while slapping is pretty fun as a bass player, it is also pretty uncool in the wrong setting, so never force it. Definitely try and learn to slap on your current setup even if the action is a little high. It will make your hands stronger and you will become more versatile. My biggest tip is learn to count. By that I mean, learn to break a lick down so you can count every single note (including ghosts). If in your head you hear 1 2 3 4 123 123 - you will be able to learn High Ground quicker for example. It's all about counting in your head so your brain slowly makes your hands play that lick properly instead of skipping ghost notes. Most newer slappers skip their ghost notes because they just want to make it through the lick, and this is a way to force yourself to do it right.