First off OP, if your doing hunts on SMN, and things are dying less then like 20 seconds, you should switch off SMN and go to your BLM, (if your going out of party).
On average BLMs, and BRDs for DPS, have the highest potential to get the highest gains on all ranks that last less then 20 seconds. On BLM on B and A ranks, both dying roughly in the same time on my server, I can still get full credit out of a party assuming I'm there when its first pulled. Raging Strikes+ Fires and Double Flare rotation pretty much solidifies you on contribution for both.