Feeling Stuck with Falling Thunder Monk

Currently doing T15 - T16 maps without issues, clearing is great. Have not done 100+ delirium yet so I don't know how the damage is during mapping.

Biggest issue is boss damage, part of it on me for not always having 6 charges entering the boss room but that's random. Boss rotation Shattering Palm -> Bell -> Falling Thunder. Damage is decent but usually won't kill boss with one hit though.

Where else can I improve on my build? I plugged some 600DPS staff into POB and it'd do similar damage. Maybe time lost sapphire next?

https://poe.ninja/poe2/profile/Rofl_Panda-5337/runesofaldur/character/Gate_of_death