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Oh my, I have never encountered such a problem. We used to have some sparrows where my parents live, I'm sure they still have them, but we don't seem to have any where I live. When I lived with my parents sparrows were not a problem, they were just one of the birds that came around. They weren't very smart though. There was always one that wanted to eat the crumbs from the cat food, but would be oblivious to the cat watching silently in her box a few feet above. She would watch the sparrow for a while, like days or even weeks and let it fatten up, then one day she would drop on it and we'd find a pile of feathers.
I don't really know what you could to other than what you are doing to get rid of them, maybe get a couple of cats? That might scare them off if the cats are really into hunting anything small that moves.
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