olgrouser,
The only suggestion I'd make about your list of steps is that you might need TWO bread-bag shims to effectively free-float the barrel. The way I test this before shooting is to grab the forend tip and barrel in my hand and squeeze. If the forend can still touch the barrel with one shim, then you need to use two, because with one shim the barrel can "tap" the forend during firing--which won't help accuracy.
