"(do not! I repeat, do not!! wet or spray the holster with any solution to aid in the stretching process)." Water?
I routinely SOAK a SASS holster in water and stuff a blue gun in the holster for sizing. I do not mold a SASS holster. Try to come out fast of a detailed molded holster. I brush on a very light coat of Aussie Cream when dry. The leather will last for years.
I also make holsters jet black with vinagroon. Talk about getting them wet. PS: Vinagroon has been used on holsters for over a hundred years.
Most any revolver has retention because of four points of contact. Sometimes five. 3:00 and 9:00 on the cylinder, same positions on the barrel, and the top of the front sight (not always). A semi-auto is a totally different animal.
The easy way is to place a damp rag into the holster at the points of cylinder contact or simply press the rag with your finger to the indentations only. Place a strip of scotch tape on the cylinder at the two aforementioned points (slick and just thick enough). Push the revolver firmly in the holster and put in a good warm (if possible) place to dry for about an hour. All that is needed that you increase the depth of the indentations just a tad. Take the revolver out and let it dry overnight.
If the front sight is dragging, then get a big file..............just kidding. Hold the holster in such a way that when you pour warm water into the holster it will soak the sight channel. Cut a pencil and place between the front sight and the top strap. Secure with, what else, duct tape. Gotta be a tad taller than the front sight. Stuff the revolver in the holster.
Let it dry.
Miss RC Model.