You don't have burst dam or great lagging. That said, you're underprepped here clearly. If you go for vibrato spam, you better deal more dam than you get in return, otherwise it's a waste. Dirge would've been great (and could cause a flee), plus you never got echoes on them. The plan here should be to force a flee and sleep on comeback, then spell up via songs and scrolls. But many people can be driven off by dirge.