Jeremy,
I have caught Flatheads on purpose during the day…but I don’t find it an easy proposition. The way I was doing it you need to know their daytime holding areas very well. You must visualize the timber underwater, and guess within a few feet where they are sitting. Plop your bait in the “zone” and hang on. In the areas I frequent this means losing a ton of tackle and line…possibly the fish. I have caught a few on the front lip of depressions too. Either way, I prefer night fishing when more fish are more willing to come out of the cover a bit. I would think you would have to know the areas you are fishing pretty well to make this work. I’m not sure this would be the best strategy for fishing a tournament on new waters. It can be done, however.
Jason.