If only there was a thread about the benefits of shooting raw… 
Oh…
Wait…
Like Dave said above, simply edit the raws, grade them all, stitch 
Granted, that’s probably quite a time consuming process though 
You still own the JPGs on the card though (not sure if Hangar also takes raw, probably not?), so you could always stitch and upload to Kuula I guess?
Not thought of getting an old cheap iPhone just for Hangar360 shots, Dave?