I had the same problem earlier today, almost got so frustrated that I wanted to sell it to the range I was at. I was shooting also with a Glock 21 .45 and a Beretta PX4 9mm and hitting perfect dead center while aiming center mass. I decided to throw in the 92fs which I hadn't shot in about a year and it destroyed my perfect target, although it did have a nice group at 25 yards in the 7 ring or about 6-7 inches low 6 o'clock.
I recently got out of the Marine Corps after 8 years and have consistently shot expert (4 times) and fired pacific division matches and shot very well (I was a Lance Coolie at the time), and since with the other 2 guns I was shooting perfect I know it's not technique. Which leads me to this question... I saw LPA sights mentioned earlier, is it hard to install or would I need to track down an armorer (Omaha, NE)? I saw their site and it looks like it may be the answer to my problem, I hate shooting kentucky windage with one gun if all my others are spot on. In the matches they offered to sway the sights left or right if you provided them with a good grouping, but up down from what I know is near impossible with stock sights, and of course my service 9mm was perfect even though it looked as weathered as a firearm can look.
Thanks in advance.