I have encountered the same issues when I switched to a top entrance for my hives. I did away with my hive-top feeders because, frankly they were just a pain to deal with. I now use a betterbee shim below the hive cover and utilize ziplock bags, quart size or gallon depending on the situation at hand, no spills, no mess, and the empty bags discarded. For some reason,the ziplock bag of sugar water warms up much quickly on top of the frames of the cluster and it is taken readily. It must be my locale, but I have yet to see a hive take more than a gallon of sugar water per season ( I only feed them late winter/early spring to get them excited for the coming year ). :-D