It's true that some grade harder than others. It can also depend on the editor. I have had editors who I know had to do extra work because I did a bar shop
and then I've had editors who have told me all they needed to do was fix my spacing and grade me an 8 -_- It all depends. Some folks are mean and greedy with the 9's and 10's over things such as keeping your period in the quotation mark even if it's accidental
I would roll with a 9. Actually, I roll with 8s no issues.