Welcome to the forums.
Also visit our Research Scientists forum where most of our MSTP folks hang out. They can also provide insight. Make sure you use the WAMC template format.
You are fortunate you have a very supportive PI, and perhaps he/she will have suggestions to get more clinical shadowing and experience. I need details about your community service. Your Sunday school teaching is not enough. You have a lot of tutoring or teaching, so I'm not sure you need more.
Your research accomplishments and identity as a McNair is an asset for MD/PhD. How well you can discuss your work and your reason to do MD/PhD will be important.