Quantitative economics is quite competitive. Macroecon, with more policy-side focus, is comparatively less so.
You will need to explain why you are interested in doing research in these areas. Focus on your strengths rather than making apologies for not so good courses. How will your math/JD studies help you in the program? What kinds of research interest you? What do you plan to do after your PhD? The SOP will be critical.
With a good GRE quant score, you can to some extent be able to prop up your resume. Your math prep is generally okay. Mid-tier to lower ones could be possibilities. You can still get a good PhD education at places outside of the top tiers.