Is there a tutorial for the Mecha tank skip in Chapter 4? I'm having some trouble getting it and I was wondering if there was a particular setup.

also are there any other sequence breaks found for the game but not done because of risks/inconsistency?

Just boost using fire bending (double-tap dodge), change to airbending and start spamming heavy attack when you reach the invisible wall. You'll gradually move downwards and should grab the ledge.