Would you like an in-game parser?

[Kaurie]

But in this case you'd want to use the buff on whatever Job is better at AOE DPS, it's still a hit and miss but there are guaranteed gains if the person is doing AOE even if poorly.

Just to be sure, make sure they used AOE skills before buffing them.

It's just not necessarily true. Some people are truly terrible at their AoE. This is why a parser would be useful.