Well, it looks like your configuration is correct.
Our experience in Remoting with our performance tests is that the socket transport is considerably faster with JBossSerialization than with ordinary java serialization, but there are no guarantees. It's certainly possible that the situation is reversed, depending on the circumstances. I really don't know enough about JBossSerialization to say more than that.
By the way, if you're doing EJB3 calls sequentially, you might take a look at JBREM-877 "New Socket Connection is being Created for Every Client Request to the Server" at http://jira.jboss.com/jira/browse/JBREM-877. Depending on your calling patthen, it might help you speed things up.