For Oozes, I'd have your Guardians ready with Wind Slash, while your Hunters use Take Aim. Assuming you haven't raised ATK at all through Weight Training, Shoot with a an Oaken Bow boosted by Take Aim should have 37-38 attack; I forget how buffs round, but that's 9-10 damage to an Ooze's 30 HP by itself. (With all five levels of Weight Training, you'll be packing 35 BEFORE Take Aim, which means you'll have 52-53 after it, and one Long Shot or Snap Shot will kill an Ooze in one go.)
Bring some Vis potions (particularly if one of your units has a certain flaw...) and stick together to get the most out of each one. You may also consider training up Poultice to help against the Poison.