You could also try a heavier bullet. Counterintuitively, at closer ranges, heavier bullets tend to shoot a bit higher. I don't know if it's entirely true (yes, it's hearsay on my part), but I've been told that a lot of Euro pistols are engineered to shoot the 124 gr ammo.
Before you start buying files and new sights, if you're using 115s, try 124s (or 124s to 147s). It might save you a bit of trouble.
If it continues, try this: http://www.berettausa.com/products/px4-series-adjustable-rear-sight-and-front-sight/e00457/
I stuck an adj rear on my CZ, couldn't be happier.