Samuel,
Thanks for your input again through this forum. You have brought several key components of feedback up for discussion. Feedback must be communicated with students in a manner they understand. This can be done in a variety of ways.
Starting with something positive sets the tone for the feedback. Connecting the feedback to the objectives helps the students understand why they are doing what they are doing and how well they are achieving in the class. This can be done easily by including objectives directly into the rubrics you use.
Again, nice job and thanks for your input. It will benefit all of those in this forum.