Mixed application indeed. Very solid performance overall on the GRE will help but probably won't be enough to make up for really spotty grades in key courses (Real Analysis, Linear Algenbra, Stats...)
When you say that your grad gpa = 4.0, I'm assuming you're referring to your A in the sole graduate course you've listed and that you don't have a separate graduate degree. Is that correct?
Do you have any research experience? IMO, given your profile you'll probably need some (meaningful) experience as an RA to stand a chance even in the top 50.