Hi, both the Traditions (Chiappa) 1853 Enfield and 1861 Springfield locks were worked on to lower trigger pull force. Many military muskets of the day had heavy trigger pull force, typically ~10lbs. However, if one expects to produce the best accuracy possible with a musket, the trigger pull force should be a lot less than 10lbs.
The only work I did on the locks was to polish the sear, tumble notch, and other lock parts, narrow the sear spring to half, and grease the lock parts. The trigger pull force for the 1853 Enfield is now 4.5lbs, the 1861 Springfield 11lbs. IMO the only way left to decrease the trigger pull force would be to change the angle of the sear and sear tumbler notch. That's something I am a bit reluctant to do.
The trigger pull force on the Chiappa 1861 Springfield as received was well over 20lbs, this heavy pull force is reported for this rifle in a number of internet references.
Regards,
Richard