Just watched your round 3 match with Zex. My entire mindset vs Mk is punishment. I know exactly how to punish most of his moves. If Mk does Ftilt fully on shield or only first or 2nd hit then that's a free Fsmash for Wolf. I sparingly use Fsmash unless it's to punish because otherwise it gets grabbed (As you know =p). I think you should master grounded B-reversal lasers because they really are awesome. JJ was right about how useful/good they are back when he told everyone to use it. Laser planking is a good idea and I wish more Wolfs did it lol.
Cues to react vs Mk based on where and what he's doing and where Wolf is in relation to Mk:
If Mk is walking towards grounded Wolf: Two options exist for Mk at this point. Walking grab or Ftilt/Dtilt Wolf. Best options are to either grab him or shield. Generally it depends on the Mk player, but most Metaknights like to walk>grab so grab him first.
If Mk is dashing towards you: Fsmash him. Most Mk's don't dash these days, but they can be punished by Wolf Fsmash 100% of the time.
If Mk is in the air and Wolf is grounded: Try to juggle him with Uairs/Fairs and to frame trap with Nairs if he AD's through the first aerial. Keeping Mk in the air is the best way to win because the grounded opponent has the advantage in almost every situation.
If Wolf is trying to land and Mk is grounded: Utilize aerial B-reversals and have shine ready in case of a SL, Nado, or Charge smash.
If Mk is trying to attack a Wolf in the air: Usually there is no avoiding this if Wolf is offstage. If you're very low then let glide attack hit you to boost you higher then the stage and above Mk. This saves taking more damage.
I can think of more stuff on positioning, but I may just make a thread on this for peepz.