I don't think I saw it mentioned yet but even things like exactly how you're handling the mechanics can cause huge DPS loss. I can't comment on T10 specifically but when I was pugging SCoB, I saw a lot of crazy things that were horribly inefficient, like melee moving to break chains instead of ranged in T6 or dropping a single meteor in T9 in each segment of the arena; after 3 meteors, effectively half of the room was gone and it easily pushed into 5 meteors because everyone was having to move to compensate for the lack of space.

Once you learn the mechanics and how to safely and consistently deal with them, you want to figure out how to keep DPS on the boss as much as possible by minimizing movement. Just general advice.