I ran out of Guardian's Favor, and I was trying 2-3 star but the mobs kept running away to spawn more mobs, so taking on three at a time was extremely rough as an Archer. So I ended up just going back to 1 star because at most the 3 star gave maybe 40exp extra.

The problem is probably that I'm an Archer. And despite being able to quickly bind all three mobs and being able to take advantage of what little range power I have at this level, it still isn't enough.