You did not say if you use this smoothbore primarily for shooting shot, or round ball. For shot the current trigger pull is probably about right. But, if you shoot round ball much it will be a little heavy. The difference is that in a smoothbore shooting shot, the trigger is pulled, but when shooting round balls, it is squeezed like a rifle. Natural wear on a light trigger will make a smoothbore used in the field for shooting shot dangerous in a short time. IMO.
Hungry Horse