I would consider myself a frequent visitor to Hawaii. $87 for a one way fare on Hawaiian isn't too bad. That said, we are going in February. Like you, we are traveling from LIH-OGG. When I bought our tickets, coach was running at $80 per person. Within a week of buying them, they had dropped to $67 per person. The non stop didnt work for us so we are going thru HNL.
$87 isn't too bad. Is it worth the wait for $20? In my opinion, no. The problem is the prices could go up.