Hawaii-based Airlines - HA miles; refund miles for cheaper ticket?

We are going to Maui May 2 and arrive at HNL @ 12:55p. Currently we have a 2:55p HA reward flight scheduled to OGG, but we now see some attractive $38 fares at an earlier time (1:38p)
Wondering what might be the the best way to do this. Should we re-deposit the miles back to our account and hope that we might use them before they expire then buy the $38 tix at the earlier time we'd like (1:38p)?
Also, if we buy an earlier ticket and we miss the flight, is it likely that they would just put us on the next flight?
Insight and advice please...

We are going to Maui May 2 and arrive at HNL @ 12:55p. Currently we have a 2:55p HA reward flight scheduled to OGG, but we now see some attractive $38 fares at an earlier time (1:38p)
Wondering what might be the the best way to do this. Should we re-deposit the miles back to our account and hope that we might use them before they expire then buy the $38 tix at the earlier time we'd like (1:38p)?
Also, if we buy an earlier ticket and we miss the flight, is it likely that they would just put us on the next flight?
Insight and advice please...

This may be a little late, but just so you know, redepositing award tickets cost $30 on HA. It'd be more cost effective to go with what you've booked, rather than spending $30 to redeposit and then another $38+taxes to book the fare.

Wholly unused award tickets may be redeposited for a fee of $30 USD.

http://hawaiianair.custhelp.com/cgi-bin/hawaiianair.cfg/php/enduser/std_adp.php?p_faqid=348