I don't think a 505 would do it for MD. A 505 by itself is pretty low for MD, and on top of the a 505 as your THIRD MCAT is not impressive. What state do you live in? Do you identify as URM? I am incredibly surprised you had a GTown interview last cycle.
Personally, I think you should skip the MCAT unless you can knock it out of the park 515+. Then and ONLY THEN, apply to MD schools the second you get your score back. 22, 501, 505 is NOT going to cut if for an MD app.
The more realistic option is skip MD all together, apply to 15+ DO schools where their average hovers around 26-27, and you should receive some interviews with that strong GPA.