The data you are showing seems right to me. About 37% go on the wait list. It is easy to accept a place on the waitlist. Then out of those on the waitlist, I am guessing it is a much lower number who actively show a strong interest in attending.
That is the real group that you want to focus on. How many of the 37% contacted admissions and said they would like to visit, & asked for an interview. Toured the campus, met with admissions and gave them a clear explanation of why Lehigh is their top choice, and why they would be an excellent addition to the campus. I think if an applicant is really motivated to get in, they will have a very good chance if they do this. Every school wants students who are excited to have the privilege to be there. They are much less interested in students who only thought of them as a deep backup and view the experience as being “stuck here.”