How high is the feeder from the floor? It should be at least back height of the chickens. This can help with billing feed out. Also as mentioned above, the tray on the feeder can be adjusted. You might even try drilling new holes, to make a smaller gap at the tray.
I use no waste feeders with 3 inch 90 degree elbows, in a bucket. I use L brackets to hold the elbows in, instead of caulk. Below is the link to the no waste feeder build thread. If you build one of these, make sure you use 90 degree elbows, not 45 degree. If you have a rooster, I recommend using 4 inch elbows, because of the bigger combs.
https://www.backyardchickens.com/th...lon-25-feed-bucket-feeder-for-about-3.834227/
Inside my bucket, with L brackets holding the elbows.
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Yes! This is the one I patterned mine after! It works great!