Jonboat,
yes, you can cast out into deeper water and catch fish. the question I would ask is, do they have structure nearby that they can relate to? if you are casting into 20 feet of water, and you drag it 10 feet up a nearby ledge, or over the top of a shelf, etc. you'll probably be in pretty productive water. Hit 2-3 feet of water too, or at least pause a bit before lifting your lure out of the water. They like to hit at the last moment sometimes. if you want to hit CJ Brown, look for places where deep water comes up quickly to shallow water; look for humps, points, shelves, etc. You have it right with fan casting, that's a must. Good luck and post your results if you get out!