I hear your pain and I'm really put off playing that game now to be honest, as I still haven't played Odyssey or Sonata. Maybe I'll finish off Resi 5 and see how I'm feeling. Been trying to get to at last 150k and then take a semi-break and play some tough stuff.
Because of Tamiel's absorb HP and MP attack in universe he is a bit harder to take out then normal. Try Bacchus / Myuria / Faize / Edge, give all of them max HP boost, or at least Bacchus and Edge then use Bacchus to continually Blindside Tamiel, that should keep him from doing to much raid wide damage.
From there just keep unleashing rush combo's as it's a safe way to take him down (with the large boost in rush guage increase he will be in rush mode quite often, so getting free combo's in will help your healers.
He is somewhat succeptable to stun still though, so having Bacchus melee him can help wonders. Not much else I can think of to help though, GL.
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