No need to send the SAT subject scores to WashU. Here’s their policy:
Do I need to take any of the SAT Subject Tests (SAT IIs) to apply to Washington University?
Washington University does not require SAT Subject Tests. However, if you do take them and submit your scores, we will only consider them if they strengthen your application.
Do you have a superscored ACT? I might consider 1 more ACT to try to get to 34+.
You probably know for your more competitive schools, your test scores put you at the low end. Are you full pay and not looking for competitive majors? Are you instate anywhere? If you are a senior, is it too late?