I also recently moved from 16.9 to 23.5 and having an issue. Before, I was using StudioTek 130 with a screen size of 130" in 16:9 ratio. The new screen I installed is 145" in 23.5 ratio and is acoustically transparent. I am sitting at 13 feet distance from new screen. I can see many small black dots specially when there is a white background. I am trying to figure out if its the material or the distance of projector from screen or some setting in the projector that is causing it.
I switched to Seymour from Steward Studio 130 screen that has 1.3 gain. I never saw any sign of pixel on StuidTek. This new Seymour screen that I built myself is 23.5:1 ratio and is Acoustic Transparent with 1.2 gain. One main differene between the installation is the distance. Since previous screen was not Acoustic transparent, it was sitting on the wall. My new screen is Acoustic transparent and therefore I put all my speakers behind it which made me move my screen 40 inches forward. I didn't change projector location.
Projector: Sony VPL-95ES. Hours on lamp around 600.
Previous Screen Projector Distance = 18.4 feet.
New Screen Projector Distance = 15 feet.
Previous Screen Size: 130" 16:9 ratio
New Screen Size: 145" 23.5:1 ratio
According to the this site that calculates the distance based on given ratio
previous 16:9 should have been around 15"10" feet new 23.5:1 should be around 18'9". So My current screen is about 4 feet closer than recommended distance. Is this distance causing the pixel issue or is it some other settings?