Appreciate your clarity. I'm interested in what the rules actually say as opposed to peoples' interpretations of what they say.On the discord, people (me included) mixed in their own interpretations and their own GM discretion. I tried to be as clear from my view as I could in this answer.
Agree completelyI believe the intention is that you can help or you can try. Not both. In helping you are already trying. Once a heal is successful it's done and no further attempts can be made.