If they gave you a fee waiver go for it. Nothing to lose but the CAS fee. If they are higher ranked and you get in, even if you decide you would rather have more scholarship support at a lower school it could help you negotiate as well.
You don't need to put your GPA on your resume at all. Law schools will see it on the CAS, so its just redundant to put it on the resume. Also as a heads up, just make sure that your GPA was calculated correctly.
The CAS Report received by law school admissions will not show if you registered for but withdrew from the test. The report shows scores, absences (you registered but didn't show up on test day), and cancellations. Good luck!
Master's not included, sadly. I would love to hear from admissions professionals here whether schools will ever re-assess the relationship between CAS GPA (as currently figured) and law school and/or professional success!