I will suggest reconvert the dungeon to a 4 man party. Single player is not good. Why shouldn't the people enjoy a dungeon just because started play later? That's very selfish. Also, reduce the duration of cutscenes. They are terrible long. 4 man party with shorter cutscenes. That should be enough. with 4 man, no one will dare to pull, and will short cutscenes, no on will have to wait too much.