You might have the lead wrong too. But if you are not focused on the moving bird, and instead you are aiming with the bead, you will miss the bird. That’s why they say you don’t aim a shotgun you point it.
I found no bead works better for me when duck hunting. The bead is a distraction from focusing on a flying bird. If you aim with the bead you will miss. I‘ve duck hunted for 45 years. Wasn’t until about 10 years ago that I really understood this. I had knocked the bead off of my shotgun and so...