Has anyone killed Kressle on challenging/unfair difficulty? I could use some pointers.

I'm running with Jaethal, Harrim, Amiri and the tower shield girl as a druid main (lvl2).

I get destroyed in seconds by the archers. Running in with tower shield girl first they kill her immediately through her 26 AC (divine shield with defensive fighting on). When I try to open with fear/hold person they all save (have only succeeded with one hold person in about 30 spellcasts) and proceed to demolish my party. Fully buffed I still miss most attacks ( I can get +7 to hit on Amiri and Jaethal with all buffs). I use a Vanish potion on Amiri to get her in position, but she usually dies in a round or two anyway without hitting anything. Kressle has +11 to hit and rarely misses an attack, even against tower shield girl. I throw all buffs on I can (bless, divine favor, divine shield, judgment of the lawbringer, rage, summon monster 1 / summon animal 1), but the AC boosts don't really help as I end up at around 18-22 which is no match for the bandits. My +hit boosts seem to be the only important ones as I can at least get a hit or two in before death. No crowd control seems to work well.

Any tips?

I took the opposite approach of trying to keep her alive.