I've hunted crows for about 45 years and rarely did I ever use decoys. That's not to say that decoys aren't needed for crow shooting. It just depends on your set-up and terrain. Some people need them and some don't. For more open ground, decoys are very much needed. But here in the mountains where I hunt, it's not so open, with lots of trees etc., causing a crow's visibility to be limited.
My tactics are probably a lot different from many other people, due to the terrain I hunt. I viewed Bob Aronsohn's crow video and can clearly see why he uses decoys. He hunts a totally different type place than I do.
For me, I walk to a high knoll or ridge that has good cover, and do my calling from there. Since there is lot of trees, I have to choose a spot that has an opening for shooting. Sometimes that opening is small, but crows will circle, squaking and trying to find the source of the call down inside the timber. They will generally fly over that opening and that is where I get my shots. Sometimes they even come down into the timber and fly through like a grouse. They are very difficult to hit when they do that. They are very good acrobats. Decoys in that situation have little value.
The lay of the land where you hunt in Kentucky will determine more than anything, your need for decoys.
Sorry for getting off topic a little about patterns for decoys, but the thought just struck me that you may be hunting areas like I do.
If you come up with some good patterns or ideas, it would be nice to post some photos for us.
Good hunting to you.
David