I won't lie and say I've read this thread in it's entirety, but thought I'd weigh in lol.
I disagree that Bard damage or the WD difference need increased, it's fine as it is at the moment. Machinist could definitely use a buff though, it has a very difficult rotation (for me at least lol) yet doesn't put out much more damage than Bard, despite Bard being quite a bit easier (in my opinion anyway).