This will not make you feel any better, but many Challengers have crooked trunklid fitment. Its not always due to the torsion spring. Sometimes the fix is to tweak the lid by the following:
If the right side sits up higher when closed, place a block of wood on the edge of the trunk opening on the left side and slowly push down the right side. Repeat until both sides sit flush to the quarter panels when closed. I've had to do this on 2 different Challengers to get them to sit right. Good luck.