It's very common with new shooters and autos (such as the Beretta 92) that have a longer/heavier trigger pull. Your other guns might even have "spoiled" you a bit; I'm sure they both have lighter and much crisper trigger actions, especially the S&W when it is thumb-cocked.
Keep dry-firing, watch the sights all the way through the firing cycle; remember, they should not move AT ALL when the hammer falls. And to prevent that movement, you HAVE to SQUEEEEEEEEEZE the trigger, not "pull" it. If you know WHEN it's going to go bang, you are NOT squeezing the trigger! Squeezing most of the way through the pull, then jerking/snapping/slapping the last part of the pull is just as bad as jerking from the beginning.