Seems to me, once the trigger trips the hammer, the strike is up to the hammer and mainspring. I don't see how the trigger could be implicated in a light primer strike.
IMO,
DF
Well, the sear sort of rides the face of the hammer after it releases, so if it's not adjusted properly, or if the outside surface of the hammer is not concentric with the pivot point, it
could slow things down (i.e. cause a lighter strike). But this scenario is a lot less likely than the mainspring or dirt theories.
