Ullr: I have had the pleasure of breaking in a few custom barrels on some of my rifles, and also a few on some pistols. For some strange reason, I follow the barrel makers recommendations for breaking in the barrel, much as you have done but, I don't do that with my pistol barrels and don't know why. All of my custom pistol barrels come from Bar-Sto or Ed Brown, yet none have ever come with 'break-in' instructions, advice or even general guidance. The rifle barrels come with their own recommendations and I follow them.
I'm not certain if it has to do with the longer length of the rifle barrel or the heat that builds up more quickly than in a pistol barrel, or whut....but, that's the way it has been for me.
With my pistol barrels, I clean them before use and then I head for the range with a couple of hundred loads, shootem up and clean up afterwards. It has always worked for me. Hope this helps. Mikey.