So yesterday my mind got blown when I read a thread about this iM, realizing I don't have to dislocate my shoulders while I do it.
I actually stopped doing H1 aside from working this iM because the rest was very easy for me and this was just so far behind. It seemed like a waste of time until I got this iM under control.
Anyway now that I've read through all the threads talking about proper technique I have changed my form and am no longer trying to dislocate or rotate the humerus, and I feel my traps working very hard while I do this. I think I have the form down, but I wanted to see what people think and how far you think I have to go until I master this. My hand width is narrow enough for mastery based on what I've read (hands just outside of delts), and I added a weight right after this.