I am using a pail feeder for the first time. Setup - inner cover with open entrance, 3/4" blocks under pail feeder, deep over, lid. It made sense to me that the top entrance might help the bees get to it quicker, but they actully are already at the top of the frames inside. I didn't consider that robbing might be an issue and haven't seen it yet, but I'm thinking I goofed and should block the opening. I know this is a dangerous question, but any opinions?