Thanks all,
I guess I have just decided to go ahead and book this return ticket to Chicago from Kona. I can't get a flight from Maui on the date I want and it seems like its not worth it to cancel my outbound to lihue and start from scratch. I read a bunch about big island last night and am pretty comfortable with 4 days there. We can always go back, but I guess I would prefer to do a little of each island at a time rather than focusing on one island at a time.
This reservation expires at midnight so I will do it in a couple of hours.