First off, if you grew up in East Texas, Tyler may be a near lock, even with a lower than average MCAT. I'm not entirely sure about how well your non-clinical volunteering portfolio will go, but compared to other applicants from the target counties, your Mormon mission and work with LGBTQ+ communities may be enough to interest them for an interview, even if LGBTQ+ issues may not be popular to address in that part of Texas... though Mormons aren't known to be that progressive either.