badash56, that's exactly how I would do it. Don't worry about just inflicting harm as established on a monster. Or any other move that seems to work.
As a side note, the fact that kick some ass triggers when you are mixing it up with the monsters, exchanging blows both ways is intentional. If there's not a danger of being hit back, I didn't think it needed to be dealt with at that level. The most important reason for this is that the consequences of missing the roll will not lead an interesting snowballing of moves. It's really just a succeed/fail test, and the Keeper moves provide enough tools to manage it anyhow.
For the ranged attack, it is true that a single shot might be uncertain of hitting, but there's nothing to stop a hunter taking a few to make sure! In cases when it's especially tricky, e.g. taking a long shot with a handgun at a monster disappearing into cover, then act under pressure is a good call.