Instead of loot I'd rather have good performance reward more gil, tomes and experience depending on the duty.

So like have the game grade your performance at the end of each duty as either Bronze, Silver or Gold. Bronze gives you the same rewards we have now while Silver would maybe get you like +50% of the total rewards and Gold would give +100%

Maybe exclude capped tomes from this system just for the sake of fairness, but if it's just gil, exp and outdated tomestones then it's a nice bonus and incentive to play well while also not locking anyone out of super important loot