Well, I usually use spells like: magic missiles, lighting, flaming arrows, fire ball, knock, melf's minute meteors, lower resistance, stoneskin, breach, cloudkill, spider spawn, ruby ray of reversal, abi-dalzim's horrid wilting, incendiary cloud, ... etc. But I always try to use the spell sequencers and trigger, and contingencies spells in the beginning of the game in case things gets hairy.
Your party looks like it has LOTs of tanks...may want to give Aerie or Nalia a try. (oh no.....is this gonna be another Nalia bash thread??
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Long live H22A1!!!!!