... continue with Angelic Buster?

A couple days ago a couple of friends and I decided to pick this game back up. I decided on an Angelic Buster since I have some %dex gear from a mechanic, one friend settled on a Kaiser and one on a Xenon. Either I'm doing something horribly wrong or this class is horrible, we're all roughly level 90 and I can barely contribute to fights. It seems the first job ability (Star Bubble) out damages all my other ones, and the damage it does is pomegranate compared to my friends, despite me having a significant gear advantage over them.

Should I continue on, or should I work on getting my Luminous to where my friends are at? The Luminous seems much better than Angelic buster, but I've been reading that Angelic buster gets a lot better in fourth job.

This is in GMS.

AB atm is weaker than both of those jobs but definetely stronger than Lumi. And you must be doing something extremely wrong if you are saying star bubble outdamages Soul Seeker...