The diagram on the lower left drawing is what to go for. A radius may be preferable to the angled end of the sear nose. Assemble the pistol and put it in a vise with soft jaws and setup your indicator on the back of the hammer with the magnetic base on the vise. Cock it, set the indicator to zero and as you pull the trigger see if the hammer cams back or starts to fall away. The preferred situation is a slight camming of the trigger back prior to it breaking. The radius on the front of the sear nose if done properly will give it a smooth rolling break. Be sure you re-harden the sear nose if you suspect you cut it deep enough to get into soft metal.