Fix it how? Chimera and Hydra aren't THAT tough, and Titan, well, Titan's tough, but it's mostly a matter of being able to assemble a competent group.
That's the thing though, if you simply, "can't," assemble a competent group, and need to rely on the DF for everything, you're going to struggle a lot. I mean, it's a social game, so you need to have some social organizational skills, even if you have a Duty Finder to help you out.
Not that I don't feel bad for these people left behind, I do. It's just, their biggest problem isn't going to be solved by a nerf.
Edit: Sigh, I feel really insensitive when I re-read this.