No. Personally I'd wait until I had more time. But if that's all the time you have then that's what you have, make the most of it.

I wouldn't waste miles for premium cabin travel on such short flights.

Try mixing and matching one-ways as mentioned above (you can now redeem DL SkyMiles for one-ways at half the miles - though I don't recall offhand what the mainland-HI rates are - there are 5 tiers now - worth checking though)