I didn't see how you got the pull down to 2 lbs (drop in trigger kit or bending sear spring, etc.) but regardless you want to make sure the pistol does not double. As mentioned before, take the gun to the range and load only 2 rounds and fire, then proceed t0 3 rounds. Do this a few times. I've seen guns go full auto and when it happens unexpectedly it can be deadly.
If your still concerned (not a bad thing) have a gunsmith look it over.