I feed chipped sunflower seeds, too. I took my feeder down for two weeks, put it up for a bit and took it down for another week. I’m cleaning it when it empties. I’ve only seen one dead siskin since, versus 12 before I first took it down.
Putting the feeder up is further reduced because a raccoon has learned how to access it, so I take it down at night. Observations https://www.inaturalist.org/observations/69829662 and https://www.inaturalist.org/observations/69998769