[ister]

I'm not so sure you need more fighters either. Until you get to Spellhold your party is definitely short of arcane magic, and unless you go to Spellhold pretty early Imoen will lag for a long time. I'd be thinking of Edwin or Kelsey if you can put up with mods.

But as far as fighters go I think Mazzy is your best choice. If you get her at level 8 she has only one point in short swords and by level 12 (which is likely before Spellhold) she can have 2 stars in any weapon you like (flails, katanas, etc.). Until then she can contribute very effectively as a sniper. All she lacks as a tank is Korgan's rage ability.