I wish they would fix contribution for all FATEs in general.

Tanks should be the only class that is based off the enmity table.
DPS classes should be the amount of damage you deal.
Healers should be the amount of HP restored to other players, excluding overheal. Damage dealt should also be included. Raises should also count - and should be rated quite high. This would encourage healers to raise people that aren't in their party.

Just basing contribution off the enmity table is silly. It creates an environment where players don't actually make good gameplay choices - healers just spam AoE heals regardless of their party's health, and tanks just spam enmity combos.