i wish i have the opportunity to fight THAT MK
you could stop those grab release chains with the jab combo
DI+zair recovery works wonderfull with MK's dsmash, you could use it a couple of time
vs MK, try to play a grounded game, with more pk fire, ftilt and jabs. PKT is the best answer to edgeguard, don't let him attack PKT's head, first hit with the tail to stop the glide, turn around and hit with the head. Also, using PKT 2 times in a row, is a bad choice vs MK, even if you hit him with the first one, he'll be really close to you the second time you use PKT, personally, i first use PKT, and then PKFr, it's safer.
You did pretty well vs the best character and player in the world, hope all your fans start to use Lucas, and maybe change the minds of SBR guys, and tier lists