I've been working on Christian Lauba's Salsa etude, which asks for slap-tongued 16ths at quarter = 126 (it actually asks for 16th sextuplets at the tempo as well, but everyone I've listened to either slows down for that or just double tongues). I can't seem to get my slap tongue much faster than 16ths at quarter = 76. I've been practicing by trying to slap with less and less tongue under the mouthpiece, and by just drilling with a metronome. I'd be happy if I could get it up to 116 or 112 even. Does anyone have tips for getting slap tongue faster?