ups, i dont notice cihanalak mod before.
reading b9creator forums, they mod a vivitek hd 920 to focus at short distances as we need. the procedure is similar as cihanalak did, but, they use a spacer to a) move out a few mm the lens and b) seal the gap.
seal the gap is important because prevents the dust come in the projector.
you say the sharpness is now more equally distributed? how about the brightness?