I need more details about the clinical research job when it comes to "clinical" vs. "research" (don't double dip), but your number of clinical exposure hours is suboptimal as described. I prefer having 200 solid hours of shadowing + clinical experience (paid or unpaid, facing patients and/or witnessing what doctors do) by submission. What did you do with the free clinic?
I don't see a mission fit with your Ohio safeties (because they mostly matriculate in-state applicants who come from their critical parts of the state), so where in Ohio did you grow up? Also, OUHCOM (DO) I think may have the largest class size (with three campuses) and is predominantly in-state (someone correct me there), so I would consider them your safety.
If USUHS is on your list, have you tried to connect with HPSP recruiters? You could also consider Texas A&M EnMed (engineering background).
I also think you can expand your list if you wish to consider some of the newer medical schools like Belmont or DUQCOM (DO).