Just a thought on finally finishing the tech chases with a kill, if you can react by frame 18 to a tech behind, then you can pivot D-smash them, or, for even more leeway, pivot F-smash.
I would also recommend Dash-->Wavedash to the spot of landing rather than dashing, because (I think) it gets you there just as fast as just dashing, but it also opens up more standing options, like D-tilting, or sets up an easier missed-tech punish.
Also, I've thought about this fairly extensively, and I just wanna throw out all the options of punishes for different techs that I thought were viable. let me know what you think.
Tech in place: JC grab, D-tilt.
I like D-tilt as an option cause it's quick with low knock back and will either result in a few tilts, or it can lead into a grab afterward, or another tech chase.
Tech behind: JC grab, turnaround D-tilt, Turnaround D-smash/F-smash, or Dash attack
I think Dash attack is interesting, but I'm not sure what it would lead to. maybe one of you with a game cube on hand could experiment?
Tech away: Dash-->Wavedash into: JC grab, D-tilt, Dash attack
I think grab is the safest here, but if you're trying to set something up at the ledge, maybe D-tilt/F-tilt/or U-tilt is for you?
Missed tech
This is where standing still at the point of landing is important. Standing still makes it a lot easier to react (in my opinion) to the different options that a grounded opponent has. Also, an important note on why I think shield stopping here is bad, is that if you shield pre-emptively then they can wear your shield down by simply waiting, eventually, you'll have to move first... Standing on your opponent without shielding is safe as long as you're prepared to shield if they get-up attack.
Normal get up: D-tilt, Grab
Roll forward or behind: Dash-->Wavedash into grab, tilts, whatever.
Get-up attack: Shield and angle forward to ensure shield grab.
OR: Shield, and after the attack, perform a double-jump cancel land (DJCL) into a tilt or grab, or just DJC a fair. You have ample time to do these after the attack hits shield I think.
It's awesome to hear that M2 can reactively cover all options with grab
that's pretty **** cool