Ummm, well, what you do to modify your guns is up to you, but frankly, I've got 150+ plus guns and if I paid someone to improve the triggers on each an every one of them I'd be filing for bankruptcy. I think the real pro learns the trigger of each gun and adapts his technique to use its trigger in the best way possible way within the limitations of that gun's trigger action. Improvements in gun actions don't altogether make up for deficiencies in technique. Not saying you have any, and by your description it sounds like you're already shooting quite well. Just realize the gun isn't always to blame, and whatever work you have done to your trigger may in the end not have as much benefit as you think it will. Unless you're engaging in competition, some minor marginal improvement may not be worth it, IMO.
I started collecting & shooting original C&B revolvers 60+ years ago & a local gunsmith helped me become a pretty fair pistol mechanic.
Being familiar with the workings & tolerances on original Colt & Remington made it easier to diagnose issues with with replicas.
One major reason the original Colt & Remington shot so accurate was they had deeper progressive twist rifling. Rifling in the first third of the barrel had literally no twist allowing the ball or slug to fully engage the rifling before the rate of twist increased significantly.
Many earlier replica revolvers featured barrel with very shallow slow-twist rifling making consistent tight groups almost impossible.
A rare few early 'special edition' replica revolvers mfg for competition with progressive twist barrels & a number of serious competitors had their replica revolvers' barrels replaced with new progressive or fast twist barrels.
I've noticed some of the later model Uberti & Pietta revolvers are now available with improved faster twist barrels.
Compare Chamber & Bore Diameters;
Over the years I've come across numerous replica revolvers where one or all of the chambers are 'smaller in diameter' than bore size of the revolver's bore making accuracy impossible. Only fix for this situation is to have the chambers precisely reamed to be slightly larger diameter than the bore.
My personal chamber preference has been to open up the chambers to be one & one half thousands larger than the revolver's bore diam.
Investing in a 6" vernier caliper or a 1"micrometer with a set of ball gauges is absolutely necessary to own if your interested in accuracy
with your revolver or obtaining a proper PRB combo for your ML rifle or pistol .
If your mechanically skilled & have the proper tools you may feel comfortable to do your own tuning & modifications or just send your problem pistol to someone like forum member 45D to make it a performer.
As we can all agree on,, developing a proper load with consistent charges & loading pressures is key to obtaining match grade accuracy.
Hopefully this information will help.
Relic shooter