I have to admit, nobody has ever let me tear down their revolver.

I'd have to look at it directly to be certain, but I'm thinking that there isn't much room for adjustment. Dirty, corroded or deformed mating surfaces can give indicators which might leave one to believe the cylinder wasn't being pushed forward sufficiently. Is the chamber mouth mating properly with the end of the barrel?
I can see where there is a screw head directily behind the cylinder, inside the mechanism, and in-line with the center of the cylinder. IF there is an adjustment point, I'd think that was it. It appears to have an angled mating surface there which might be part of the adjustment parameters.
The tool has blades for various screws and a nipple wrench. Whether one fits the adjustment mechanism, if such exists, I don't know. I would think so.
In as much as most other revolvers don't do this all, what are the indicators that tell you "the seal formed is not as tight as it should be"? After all, this gun IS 145 or so years old and it may never have functioned as you think it ought to have done.
However, that is darn neat and you've already done something few of us will ever get to do. Sounds like a magazine article should be in the works.
