Tanked all four blind: P9 was a breeze, P10 actually had a wipe, and P12 almost did toward the very end. Went back in later and had an early wipe in P11 and a disband in P12 because everyone but the tanks struggled to stay alive. I'd probably recommend any struggling non-tanks to at least try off-tanking if they haven't for the faster queues, extra durability, and few mechanics you personally have to deal with.