Thanks for the extensive response!

You weren't kidding about the DD queue times. Those are serious progression killers.
I was thinking of speeding up the leveling process so I can unlock gunbreaker faster and step away from DD's. I realized that the role, at least at this level of content, was not meant for me.

Do you think it's worth the effort to go into the palace of the dead to grind from 50 to 60? Or am I better of following the MSQ's?

At this point I question the requirements for unlocking the newer jobs. Growing with your favourite job is part of the fun and just jumping in at 50 or 60 seems strange. It was dumb of me to set my sights on expansion jobs early on, it just makes my current job seem like a lesser substitute.