That's a good solution; try obtaining/using your Quickenings too. They come in handy right off the start of a battle while you have full MP and can knock off a goo chuck of the enemies HP. I fought Demon Wall and started off linking Vaan, Balthear, and Basch's Quickenings for 7 hits and it dealt 10,000 HP damage to Demon Wall, just 100 short of killing him.