It is removing one of the filters that allows for better color accuracy. Normal mode also does this on the Panasonic. With both the panny and jvc the general thing I have seen said is anything over 100" will result in an image to dim for 3d. Which probably means it will be like at a cinema. I did try a 110" scope screen with the ae8000 and it seemed bright enough in eco mode and cinema 1, but not as bright as I would like and am accustomed to with my BenQ.
I think I have a green convergence problem though as indicated by the focus pattern and the words in the menu all of the letters with horizontal letters like the letter E have the horizontal line is green. In the focus pattern the vertical lines are nice and crisp and the horizontal lines are blurry.