if it's anything helpful, as a dps you present a very real possibility of doing good DPS, reducing time spent to obtain exp. Although you may not view this as a fait tradeoff, it is somewhat of a tradeoff. The best way i find is to help out your FC mates, and they could help you back. i have only 3 more classes to get to 50 (BLM,MNK,CNJ) so I've really seen what can be done as a DPS. Roulettes have already been said a number of times as well. Always eat your food it's a massive difference in the end.