Thanks for the vid, fun watch. We actually just had dps stay in on his Force Storm to maximize the burn phase. The damage is negligible with personal defensive cd's, hots, or even a nice IA group bubble.
That being said, we pushed him to 4-5% multiple times, his bubble triggered, but instead of starting his rp he just continued to smash faces. I know that there was a bug on regular mode where if you dps'd too hard you could accidentally push past his bubble rp so it felt like this same issue was carrying over.
We'll keep trying.
If I'm not mistaken, if you actually push him into RP phase while he's channeling an ability, it will skip RP entirely and continue face rolling your group. Be sure you're careful about that. I read they fixed this bug, but with this games ongoing issues, I wouldn't doubt if it's still there. Good luck!~