I´ve had a Nec 9 PG for a couple of weeks now. The convergence is just fine, but I have trouble with getting even focus all over the screen. It is possible to adjust center and edge focus separately so that I have either focus in the middle or on the edges. But I can´t seem to get a good adjustment all over the screen. It gets a bit dim. I know I may have to compromise for allover focus, but this is not "acceptable". Will astigmatism (shape of dots) have anything to do with it? Any other idea what might be wrong?