I have seen numerous cars with warped decklids for exactly this reason and it is an extremely difficult problem to correct given the double skin of the hood in that area.
As I have posted elsewhere the fulcrum point for the oem decklid shocks is less than ideal (worse with a wing), I recommend and use the IPSCO relocation modification, which also solved my deck lid leading edge catching the roof when opened.
http://ipsco.org/Pantera%20Par...id%20Shock%20Kit.htm
Julian
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