These are the average composite SAT scores for each of the schools you mentioned:
University of Chicago: 2228
Washington & Lee: 2082
And these are the average Math SAT scores:
University of Chicago: 746
Washington & Lee: 692
Based on this data, I would say that you still have pretty good chances of acceptance at Davidson, Emory, and Washington and Lee. Since you're emphasizing your success in the humanities and desire to pursue an english major, these schools may be fine with your below-average math score, especially considering your composite score is still above average.
University of Chicago is a tough one. Since both your composite score and math score are below average, it's probably going to be a stretch for you to get in unless you have very, very impressive extracurricular accomplishments. At such a competitive school, your math score could give them pause about admitting you when other candidates have performed at a higher level all around.
Overall, I don't think your Math score will damage your chances too drastically at these schools (especially because colleges pay more attention to composite scores than section scores and you're not majoring in the sciences). If you've already taken the test three times, I wouldn't recommend retaking it unless you have some sort of test prep epiphany and your practice test scores shoot up by 100+ points. Your time is better spent perfecting other aspects of your application.