Forgive me if its already known, too lazy to read the whole thread or watch if its already in a combo vid :)
Instead of going for 2A+B~22A+B for the normal 47 Damage or something you can do 2A+B~RCC~A+KB~Umbrella for almost 70 Damage.
Its guaranteed for all Tech directions except LEFT. Of course with Setsuka instead of doing the real RCC you only do one wave dash, so its 2A+B~236~A+KB~Umbrella...it requires some timing, better train it :)
If they dont tech at all its 63 DMG, if you catch them while teching up to 75ish.
Fot those who tech to left you can delay the A+KA which will give you a "Slide hit" for another 23 Damage, but i would rather run up and take the Sidethrow Mixup since you will catch them from the side.
Or if you are supercool, wave dash into B+K is a tech trap which catches LEFT :) So there you have your 100+ :) Its not easy though, have a look into it and tell me your observations! Timing required for the Sakura Tech trap....but i guess 120 DMG is worth it! If they eat this one you basically get the initial combo for almost free!
Tested only on Yoshi.
Doc out.
EDIT: Somebody needs to check all chars for the B+K Tech Trap, looks like it works very well on Yoshi, but not at all on Kilik. of course. Guess its hitbox depending again, worked also on asta...