I also bank fish at G-ville in alabama. I would say do some night fishing with lights if you can. Also fish under bridges. Try to find drop offs. Get a map of the waters your fishing or use the one on bass pro and see if there are ledges. There as some articles about it on this sitehttp://www.crappie.com/bruce/crappie_on_the_rocks.htm
http://www.crappie.com/bruce/article3.htm