Tip, I see your PJ is slightly angled up. And this will affect the keystoning. If possible, it may be better to remove the drop down ceiling, or just angle the ceiling upwards in the middle. This way PJ could be higher and kestone could be set at 0.
Not knocking by no means, its a very clean set-up.
Here is the angle I speak of, a lot of personal home theaters are like this.
This would be like looking from pj to screen right down middle of room.
(Edit:: OOPS, forgot to say PJ must be a few inches higher than the screen, so screen area could stay the same.)
Pic is clickable below...