Fiberglass never stops moving. Lean it against the wall, cover it with a blanket and put something on top of it, store it in the garage rafters. Any and every thing will effect it's shape.
>To do repair it correctly you are gonna have to section the edge of the hood nearest the windshield. Probably a series of saw cuts around ten inches long lengthways.
>Then cut a wooden template/brace that has the cross section shape that you desire, might have to use a second well fitting hood as a guide in making the brace.
>Sheet-rock screw this brace to the top hood at either corner and fasten each piece of hood material between the cuts to the brace in the same way.
> At this point you ought to have all of the flat piano key-like pieces of the windshield edge of the hood forced into the shape that you need and screwed to the wooden template/brace that was made from a properly shaped hood.
> Duct tape the top side of the hood where the saw cuts are and lay fiberglass mat soaked in resin/hardener mix along the saw cuts. Push the mat into the cuts marks, and do it again and again until it's nice and strong.
> Remove the tape and spread a short strand fiberglass gell resin/mat mix into the saw cuts.
>Cover the exposed resin-filled saw cuts with a layer or fiberglass woven finish mat/resin/hardener mix and leave it alone forever.
>Unscrew the brace and repair the remaining exposed cuts and such. In the same fashion, inside and outside.
>Sand, skim coat, sand, spot fill, sand prime, sand, prime, seal, and eventually paint.
OR . . . maybe just but another hood that's perfect and sell the warped one to someone else.
I might have run over something that needs a little more explaining, but essentially you are going to have to relieve the stress and warpage through relief cuts and then reconfigure the hood using a brace/bridge/template made of wood. And re-fiberglass the controlled damage that you caused.
Luck!
TC