Creed vs Rav:
Could you give us some detail about what numbers you are getting. The freq value on the weapons, the per-hit damage, the number of hits per shot and the damage amounts (ensure both are equally modded).

AK:
Could you give us some armour and resist values? A poison modded AK's instant damage is 50% poison, so we need to ensure it's not just a DoT issue.

AoE:
We did deliberately lower blast damage. If you are hitting four or more mobs, can you try to see what total damage you are doing.