Its lost its reflex, but does it actually have much stringfollow, and has it dropped in draw weight? How long are you going to be in the humid zone? Are you prepared to have to redo the leather grip, and overlays if the glue line lifts during heat treatment?
Personally I wouldn't bother if I was happy how the bow performs for your task eg hunting the difference won't matter much, if it's a flight shoot bow you might risk it, for the extra distance.
In all likelihood hickory will respond favorably to another heat treat/small reflex, for the short term, but sooner or later it will probably return to its current condition.