Maintaining charges in Party

Hi guys,

Looking for some input on how to maintain flask charges for party bossing (trial, etc). I have charges per second belt with increased charges gained and reduced charges used, I use alchemists boon, and I use 60% increased charges on mana flask, but in party content I’m finding im running out of charges when the bosses are at like 15-20%. I have level 32 pconc with gear.

Any suggestions? Would a 0.25 charges per second be better for maintaining charges for the longer fights? Solo content charges are not an issue at all.

Any help appreciated! TIA!