CMRA, since you have both test screens in your possession, can you take some pics against a neutral grey screen? Some test patterns would be really helpful (color stripes, black and white patterns). It would go a long way towards helping people (especially new people that are seeking objective data by which to make a decision on their screen design) decide if they want to go for a simple application like a rolled on neutral grey paint, or a sprayed on metallic mix.
Obviously the simple neutral grey is less expensive, the application is more forgiving, and no special tools (HVLP sprayer) are needed, but if the benefits of a metallic application are evident, some folks will take the more complex road. As of now, I've never seen any of the inventors of the metallic mixes go through the comparison to a neutral grey of similar shade.