Again, there are limitations to what a given field can produce before you do damage to it. The Gulf Coast has potential because there are areas that are off limits near the Florida Coast. The Louisiana district is much older and has been in a slight decline for a while now but newer methods have helped to raise those levels somewhat.
Even in a proven field, there are pockets that yield more than others. It all boils down to what you find when you drill a well. There is still a great deal of risk involved.