@beachhead In addition to asdjklcolon's comment, you could also rethink your strategy. Use a different party, change your equipment, etc. I'm sure there is some forum post that can help you.
Level 3-6 is a bit tedious if you're going for the three stars. Even if you one-shot it, you usually just didn't smash enough wood and get two stars still. Which wouldn't be a bad thing if this could be solved by skill rather then luck.
Sorry about that! I'll try and get that fixed soon.