Couple of notes here: 103.7 was moved in from Conroe-Willis, not Lake Charles. True, a Lake Charles station was affected by the move. 100.7 KKHT is a rimshot as well. It's also on the Devers tower as the afforementioned frequencies. It's successful because it is serving a a loyal audience with Christian talk programming. The others might do better by serving the area it actually covers or target a specific audience.
I've stated this before, if 97.5 was mine, I would make it a Galveston County radio station. Maybe it would work, maybe not, but I would try it. It will not make it as a sports station.