Fill the corners in and kill the bleacher sitting. Move everything to seat backs.
I can't imagine you loose that many seats by filling in the corners when eliminating the bleachers. But that bleachers are so H.S. looking and feel to it.
I want LES to have a premium stadium feel to it. And honestly, I hate knowing I'm going to lose half my seat during the game to people just moving in where they don't belong.