When I set up the Vava 4k projector to project a 135" diagonal image, the dimension from the bottom of the projector (Table) to the bottom of the image is 17.5". This is much more than the Projector Distance and Image Dimensions table in page 6 in the manual where 120" is 13.9" and 150" is 16.5". I think 135" should be between these numbers and not over the 16.5". When Interpolate the data in the table, the 135" image should be ~15.2" above the bottom of the projector. The projector is level and perpendicular to the wall. My application is a built-in cabinet with a floor rising screen and getting the 2" back is critical to keeping the screen housing at the same level as the top of the projector.
What am I doing incorrectly?