Another article on the Mets' plans to possibly change the dimensions at Citi Field reveals a potential reason for their lack of home run power:
↵↵The most apparent solution to the wall, which has vexed right-handed power hitters, would be to lower the home-run market to eight feet.↵↵
Clearly, this is the answer. The Mets have been trying to hit home runs, when all they had to do was buy them!