Have a customer(home) with a 7ft dynamo table that wants to copy the rail speed of a local pool hall. They have great american 7ft tables and have changed the factory rail cushions to something else. They won't say with what. The speed of them is ridiculous, especially for a 7ft. They have them raised as high as the rail bolts allow, otherwise the balls hop off of them. Any advice as to what could be used for new cushions to increase the speed?