I agree the sooner you book using 5K, the better. They are strictly capacity controlled.

As a sidenote, Aloha tends to be flexible with its policies. My experience has been that as long as they have seats on a flight, you can get on it. So if you have reservations for a 10 am flight but want to leave at 2 pm, ask if there are seats (that day), and I've never had a problem getting a later flight with no penalty.