They should work good. I love gray jigs.
They’re going to do well, I’m confident. While you’re fooling with the gray things, try a streak or red in the tail. I have used about 5 or 6 strands of kip tail, micro chenille, a stub of yarn, you get the idea. They have done well for me. Some smaller ones helps build you skill level also. Keep after it, lookin good.
Agree with LedHed especially the Red thread part, but you can also hide the thread when finishing regular chenille. I am not sure what your body is so maybe that is why you need the thread neck type? Anyway that really doesn't matter much, but the Red will I believe because it't part is showing the gills.
Skip