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hi, I use the ZH-406 in a media room with a painted wall, no screen for this particular setup.I have the projector 11.5' from the screen and I have to use zoom to get a 100" image (basically I have to go all the way to 1.6x optical, 0.8 zooms from 11.5 feet from the screen to get a 100' image)... How far is yours from the screen? The image I am getting from my Bluray player is awful, and from my Roku stick is fairly good.
are you measuring from the front of the the lens, it looks like it would require 12' 3" from front of the lens for the 120" screen.
https://www.projectorcentral.com/Optoma-ZH406-projection-calculator-pro.htm
What bluray player are you using and what issues are you seeing?