Henderson's a tough place to learn. The water level changes all the time and certain areas clear up faster than others. The pros can tell you where/when that occurs based on river levels. I'm not that pro! I've done well at certain times but I always feel like I'm chasing them out there.
Go a little further to Whiskey Bay. The fish move around out there, too, but I find it's more consistent and not as crowded. It's not as quiet and scenic as Henderson but I can almost always catch a couple meals per trip.