Congrats on a solid score. It's funny somewhere along the way a lot of people got hung up on getting an 80/80 percentage split. While it's nice and all, it's not a requirement.
The key is for you to be able to show your quant skills outside of your GMAT.
Ideally you can do this through your career, your transcript and through the extra class (like the math course you took).
I wouldn't sweat the split too much if you can make up for it in other areas.