My previous adventures in stove-top bluing involved rusting the parts hanging from wires on my back porch. The low desert humidity made the rusting process take a long time.
This time around, in addition to several hours of metal prep that I hadn't done on the earlier iterations, I changed both the application of the bluing solution and the rusting location.
The first guns had the bluing solution applied while they were hanging on the porch using a big cotton swab dipped into the jar of solution. LOTS of solution got on the parts and would form drips at the lowest edge that made the rust layer inconsistent. This time I applied the solution using a piece of an old t-shirt and wiped on just enough to wet the part without forming drips.
The wires that were previously used were replace by zip ties for several reasons. Primarily the wires were rusting and introducing contaminants into the boiling water, and secondarily the length of the wires was a pain to deal with while trying to boil the parts. The zip ties are much shorter and can stay on everything except the sideplate while they are being carded.
The biggest change was the location. Instead of hanging redneck wind chimes on the back porch, I took over the guest bathroom.

A long steel rod was placed on top of the bathroom shelf so that the parts could hang out of the way of normal bathroom activities and the bathtub was filled with hot water to raise the humidity.
The result was a very consistent layer of rust in less than half the time it used to take on the back porch. I was able to get two 4-hour rusting sessions completed today, with boiling and carding after each session.
This will be a long one. There is still a week of rust cycles ahead, followed by a 24 hour soak in an oil bath, then we have to do the final fit on all the internals, and there's going to be a week of traveling in the middle of it all. If all goes well the test fire will be around the first of the month.