Felt diffraction reduction advise

Cut a couple pieces to match outside size of tweeter and perfect round cut to go around dome fairly close noticed slight change in sound stage. Then made another to stack that's when I notice loss of sparkle. Using blue tak so I can install and remove quickly for now. Maybe there is something to cut out being rectangle or star pattern, or stepping each layer with larger cut out like a horn. Does it matter how close felt is to button of tweeter? I'm going to just try strips for a square pattern and see what happens. I agree if there is a benefit why don't speaker manufactures use this, maybe cause it's ugly, if it works I don't care.

Have to say there is something to this. The circle cut out didn't work. Strips made into rectangle does change things for the good. Highs seem smoother, relaxed and more air and stage no loss of highs or feeling it was killing the sound. I had to stack 6 felt strips to make 1/2 inch strips to form the rectangle then made a lip on top and bottom totaling 9 strips to make the 3/4 inch lips. It's like the more felt I added the better things became which is the opposite results adding the circle cut out. I kind off copied the Dunlavy speaker Eric suggested, thanks Eric