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Another question:

How is "viewing angle" defined? Eye position to center of screen, or eye position to far edge of screen? Makes a big difference on wide screens, especially if the front row is relatively close to the screen.
This is something many don't consider too carefully. Let's assume you are sitting dead center and the projector is only a couple of inches above your head. The light striking the center of the screen is reflected back to you fairly directly. As you look at a spot on the screen further from the center the light has to be reflected back to you at an increasing angle. The screen has to have some retro-reflective ability to do this. A matte surface does have a mix of retro-reflective and angular reflective abilities an is therefore the best at producing a uniform image through a wide viewing angle. Anything we do to boost the gain reduces the viewing angle and therefore introduces issues for some viewing setups.

You have asked a very interesting question that I don't have a good answer for but I do recognize the issues you are raising. This may be especially troublesome with a Pearl Clear Coat if the flakes are for the most part parallel to the screen surface. It would be very angular reflective and have very little retro-reflective ability.
 
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