Agreed that this is too tight on the DPS check. Byakko was my first venture into non normal content and I agree that it was very easy. I only ever saw enrage on him once, and that was with a mostly new group of players.

Suzaku is a different animal. People who were practicing on the level 70 synced minimum item level version have been reporting that version is much more forgiving on the DPS check. I don't think the boss needs to be as easy as Byakko, but a 5% reduction in HP would probably be sufficient. 10% would be generous.

My current best run last week was 4%. I had no deaths and only one vuln stack, but I can't speak for the rest of the group. No matter how sternly worded the party description is, you can't control the other 7 people and all it takes is one person with a bad attitude to ruin a group.