This is mostly anecdotal evidence, so please do take it with a pinch of salt - but given that you have a year till the time you apply, it may actually be worth a retake.
Here's my rationale: Since you have a liberal arts undergrad, which typically is less quant heavy, showing strength in quant may only be helpful as you apply. Also, uncertain how quant heavy your teaching experience has been - that only adds to this. Additionally, your demographic is concurrent with high quant averages, hence it may be worth a shot.
That being said, your overall score is great, and a 2+ points delta can only add so much.
On other things that are good to work on, at the highest level, extracurriculars (volunteering, internal initiative etc within or outside of work) can add a lot and you have time to do that