If what you are running is really non ethanol, it has to have had a HIGH moisture content in it. I am not a fan of additives....and I know I recommend some, but only a few. There's a product called HEET in the RED bottle that removes moisture. It works really well too.
Since I switched I haven't had carb problems at all. Before on ethanol gas it would foul up a carb within a few months. I would have to take the 600 Edelbrock off and go thru it to clean it up.