I'm going to suggest a few places here on the website to help you think through grades at this time of year.
The first is a video of Gail and Joan discussing this topic with a teacher. https://www.thedailycafe.com/articles/sisters-on-the-spotcommunication-and-grades
The next is a link to an article about "Touch Points" that discusses how you could relate the rubric of 1-4 to student's work on specific strategies. https://www.thedailycafe.com/articles/touching-base-with-touch-points
This last link is to the area of the CAFE main page that shows us the assessments prepared for each strategy, and some related articles: https://www.thedailycafe.com/cafe/assessing-student-learning/assessing-each-strategy. Each of these assessments has a rubric to help you detemine the child's success level (which could probably turned into grades).
Hopefully, looking at these areas and the links noted there will help you find some ways to help you clarify your thinking. If you still have questions, please don't hesitate to post them here!!