I would cease and desist with the fork straightener, because you are adding cold-setting cycles to metal that has already been stressed. Take the fork to a frame expert to see if it can now be put right.

A front impact often transfers pretty high stress to the frame at the lower head lug. You really need to give that area a sensitive inspection, using sight, touch (feel for rippling and paint aberrations), and some close-up photos posted here. The down tube can show rippling where the lug ends or where the butt ends.