That's a common problem. Short (18"-20") shotgun barrels frequently need a "base" thats soldered onto the barrel to keep you from shooting high. There are aftermarket beads you can install that are taller, but they are a bit more prone to be damaged.
I'd take it out and pattern it, and I'm willing to bet you'll end up holding the bead level with the coyote's underside, or even lower at any distance.
..and +1 on the ghost rings sights. They work great.
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