I don't understand how the hammer can be in the sight picture. The hammer is below the rear sight as it is part of the frame / top strap. Unless the hammer is somehow grossly miss-shapened and I can't really see that either. I think you must be watching the hammer. Post some pictures of the gun.
I just took a machinist rule and layed it across the top of the frame and down ito the groove that forms the rear sight, allowing the edge of the rule to come across the top of the hammer spur of my 2.25 SP. Without measureing the gap, I would estimate that there is close to .030" between the edge of the rule and the top of the hammer spur. After unloading the gun, I took the same straight edge and again laying it across the top of the frame and down into the rear sight notch, I very very slowly DA the gun. At the very highest point in the arc of the hammer; the frame strikeing face of hammer just bare came into contact with the straight edge but did not raise the rule. At no point in the arc did the hammer enter the sight picture.
Post some pictures. Unload the GUN!!! Lay the machinist rule down in the rear sight groove without it being in contact with the front sight at all, with the rule extending back and over the top of the hammer. MAKE SURE THE GUNS UNLOADED BEFORE THE NEXT STEP. Now slowly stage the trigger allowing it to start through the arc. The hammer may come in contact with the edge of the rule but if it doesn't displace or pickup the rule, the sight sould be clear. 
I have a 2.25" my son 3.0625" and both are just alike except for the obvous barrel length. NO sight picture problem; I painted mine yellow, his are orginal, they're small but you don't generally need complicated sights on what is in all actualality a defense gun. There is no sight obstruction cause by the hammer on either of our guns. All else fails call Ruger.
