Lol sorry, i just love my acronyms. That's basically the only reliable way i go for killing MKs now, i don't really try for the Ftilt to Usmash on him anymore because if i do it too late, the decay is off, and if i do it too early he can get out. I usually just ftilt him until i can utilt him. Then probably get a ftilt to dsmash, grab him -> pummel and then wait for the release.
*NOTE* If you pummel him [idk the EXACT frame or timing] right before he would usually break out popping up, then he will fall to the ground. That goes with EVERY character, so better to just pummel once or twice instead of trying to get over 9000 damage with pummel. Then GRUST IT UP BABY