I want to hide grades so that I can grade the entire class. But when I do so, and start using the rubric, that rubric, and the comments in it are visible to students, and I am immediately besieged with comments / questions even before I've finished grading (and have a chance to go back through my grades to adjust them as needed).

Apparently this is normal behavior, according to this link. I am not really surprised, nor even disappointed, but I am frustrated and depressed that I now have to create a separate document, write all my notes there, and then paste them at the end of the process. 

There ought to be a better way. 

If there is and I'm missing it, please enlighten me.