There's a fine line between not-quite-enough and way-too-much decklid lift pressure. As Julian said, it can not only screw up the hinges, it can warp the support reinforcement under the roof skin or the decklid itself. I once worked on a Pantera with a double-element fiberglas wing, and it made the decklid assembly so heavy, NO lift cylinder would open the lid, even the dangerously powerful ones. On that car, a simple hold-open clip on a std lift cylinder sold by Pantera Parts Connection worked just fine, and fits in the gadget tray of the console. Don't over-think the problem...
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