Sure, I believe everything I read. But you made it sound like in your post that I quoted that the BenQ W1070 is incapable of being uniform sharp, corner to corner, unless you go the max "zoom" and then physically move the projector in to where you need it placed. This is just not true.
YMMV that's for sure. It's great to hear that your BenQ projector is not distorting the image with vertical keystone and that there are no focus uniformity issues with your lens. I personally have the issue with the lens on 2 projectors, produced in August and July 2013. Could this be a production defect limited to a specific range of projectors? Numerous users have also reported the same issue many times in this thread.
If you have another method to lock in a razor sharp full field image, please share your technique as I haven't found any other way to attain it on this platform.