This sounds more like a DPS role problem, and honestly ppl that do hunt trains or S ranks should know that playing dps is just griefing your party, you either play healer or tank you only need to throw a couple aoe heals or use your range attack as tank with the stance on, turning the hunts into fates wouldn't change the situation that much either cuz to ensure a full reward on a fate you will also end up spamming heals or enmity as tank