Unless you are getting a snug bolt on closing, there is no need to bump anything. You will be creating more headspace, which is a bad thing. If you have the die screwed in until it touches the shell holder, plus another 1/4 turn down, you are getting a full length resize out of your die. Do they chamber easily, or do you get a hard closing bolt? By your post, I don't fully understand what you are trying to do. You screw the die OUT when just bumping shoulders. You state you have been full length resizing, so your shoulders are already being pushed back. A little more info would be nice.
