Don't worry about sight radius. The P11 isn't nearly refined enough for longer distance sighted fire. At least not in a social situation, or in any circumstance requiring speed. The gun just wasn't designed that way. I would also suggest that the key to conquering the very snappy recoil is to grip the gun as tight as possible when firing it. I've found this gun to do better with one handed rapid fire point shooting than with slow fire sight picture 2 handed shooting.
The thing to remember about all handguns, but especially small ones with terrible triggers and bad recoil is that from about 5 to 15 or 20 feet and when firing rapidly, your sub conscious mind can keep track of where a pistol is pointing, even under harsh recoil and muzzle flip, much better than your eyes can interface the sight, your hands and the target together. I've found this definitely holds true at the range while standing still and shooting P-11s at stationary targets, so imagine how much more important it could be in adverse conditions if your life is on the line. Bottom line is that I don't suggest you get a gun with a small size, harsh recoil and muzzle flip and one of the worst triggers on the market if you plan to potentially use the sights in a defensive situation. It will not work.
It's no secret that I hate DAO and find it incredibly deficient because of the lower possible rates of fire, and that is particularly true of the P-11's horrendously long pull, but I gotta say, these don't make a terrible choice if they fit your needs. Kahr and Glock still make better alternatives, but for the money, size, power, capacity and reliability, you will not find a better gun.