You've seen all the docs at this point. No, there isn't much documentation in HE when it comes to the protocols. I typically start with the ST docs, try it, and then change as needed if the supported command version is different, or if I know an HE implementation is very different than ST (like it is for buttons/button presses).
That said, it is often very easy to port many ST handlers to HE. There are a couple threads that have a known list of things that have to be changed/are different in HE. These are good starting points/reads:
