Oozes will still show up in the later battles of the first area. That said, your Hunters should be able to land some good hits on them now.
At this time, no items will drop from battles. Maybe in the future, I'll add some drops to the bosses.
EDIT: Oh boy, the Troll. He's actually packing 4 less Defense than the Oozes, but he's got way more HP. It's probably good that I didn't give him a regeneration effect, now that I think about it!
Long Shot might be the more economical option MP-wise, unless you really need the range of Sniper Shot to pick off an enemy. Combining Take Aim + Snap Shot might also be worth trying. His underlings can't beat his DEX, so they should be in his way on the first turn; that'll buy you time to pick off the other enemies. If you can stay out of his range (5 move + 4 range on his Fire spell), then you might get some time to clear out most of the grunts.
