Go practice the lake and you'll figure it out. My partner and I went out and practiced the lake every day we could. And found some spots and ended up one of the only teams in the THSBA tournament to catch a limit there. We finished 10th but it was only because we went out there and practiced and put in the hard work trying to find the fish.
easy way to catch a limit many times on Lewisville is to start on the corners of the dam and throw a jerk bait and a shakey head. also top water and square bill. It should be very good by then and you don't have to know much about the lake to catch them there.