Rubrics are valuable grading tools because they allow for consistency and clear expectations. However, it is important to remember that they may need revising over time. You must take the time to reflect on your own work, just as you are asking the students to do, and make improvements where necessary. These changes could be in the content goals or the wording of the rubric.
I am an English teacher, so I use rubrics all the time. I will be working to individualize the rubrics more to each assignment.