Grew up in a damp place and big kibble was a jam magnet in every feeder I tried and... what finally made the difference was treating it like a flow problem instead of a power problem. I raised the feeder a bit so the food falls cleanly into the bowl, stopped topping the hopper to the brim, and shook out the dust from the bag before filling. Then I mixed in a small handful of smaller kibble as ball bearings and it kept the chunky pieces moving. Works great.
If you do not want to mix foods, you can get similar results by running a larger test dispense after refills to clear the throat, then switching back to your normal schedule. Also worth checking the path for anything that creates a pinch point like a warped lid or a misaligned baffle. Tiny things, but with big pieces they add up fast.
