finished a arrb but can't get 'before the dawn quest' where is it?

[Hasrat]

But I want to call out this same bottle neck, 30 additional quests... is now blocking me getting my level 52 class spell quest.

Just remember, even if you could get your skills, they won't be available in synced duties until you're in HW content.

It's all one linear story. Exp rewards have been boosted in a lot of it, because it's old content now, so yeah, you're going to out-level it unless you're spreading out over multiple jobs. But, since you've got to progress through the whole story anyway, it's not like it truly holds you back from anything.