My loading meathod is very similar to yours. After I load, I do nothing to the barrel.I know guys that use a lightly oiled patch but I've never done that because I've never tried it at the range so I have no idea what it would do to the accuracy. I would encourage you not to do that if you haven't first seen where it shoots with that process.

I've left a gun loaded for two weeks before and it went boom just like it should have and hit where it should have at the end of the two weeks. I donot bring the gun in the house though. It stays in as consistent of a temp as I can keep it. I normally keep it in the truck.