I noticed that the DA pull on my 686 is very light compared to my 657. To me the 657 has quite a heavy pull and I have a hard time shooting accurately in DA because by the time I pull hard enough to move it it's hard to stop. The 686 I can keep under control and do better. What determines how heavy the trigger pull is in double action? The 657 is N frame, but I can't think of what that should have to do with it. Maybe an action job on the 657 could lighten it up?