As quite a few people have said already, a lot of your MP problems can be alleviated by having your party members play properly. For example, I just ran The Stone Vigil last night through the Duty Finder, and everyone there was new to it and didn't know a single thing (granted I know the dungeon itself isn't exactly hard, but to most people in the Duty Finder it would be lol).

The best thing about this group though, was that they knew how to play. DPS used CC, tank was great at holding threat, and everyone avoided the bad stuff on the ground. Usually only needed regen and a few cures each pull. Only death was my own on the last boss due to bad luck. After running from all the red circles on the ground, I ended up on the side he cast his breath on, only way out was through the circles that slow/damage you, thus I died. Best part though, the two BLM's we had started healing in between DPS'ing, all the way to victory. Best Duty Finder group EVER.