In my opinion, you can talk about the all the items you mention in your first post and convey a nice message. I'm going to paste a quote from my premed adviser on the PS:
"The personal statement is your opportunity to convey a personal perspective to admissions committees on your experiences, motivation, achievements, and passion for medicine. You should reflect upon what you have learned from your experiences; the narrative should reveal your values and personal attributes through the telling of your story and your individual journey. The essay is not a restatement of your resume or information contained in the experiences and activities section of the applications. The essay is the place to provide a mature and deeper context to your background and motivation for pursuing a career in medicine."
I think this is pretty good advice and following it worked out great for me. I'm a nontrad too (5yrs USAF and grad school, etc.). The PS is your one time to tell them something about who you are. Just keep it pithy and make sure it flows. I think the hardest part is getting started on it. Honestly, I think your original post will help you. My adviser suggested we write a mini-biography before writing the PS. It helped me get my thoughts on paper, and organize a cohesive story.
In terms of what schools will like what...forget about it. If I could offer any advice (or if I could redo my application cycle), I would have listened to my adviser and applied to schools that I wanted to attend, NOT those where I thought my numbers lined up with their numbers. Clearly, your numbers are pretty good. I have very similar GPAs, but only a 31S. I applied to too many schools with ~31 avg MCAT and only 3 "top 20" schools. I ended up getting interviews at all of those 3 and accepted to "#1". So, numbers mean a lot and will get you looked at by many schools, but your experiences are what make you a unique applicant. If it were only numbers, I would never have been interviewed (let alone accepted) at HMS. There are plenty of kids out there with good GPAs and high MCAT scores. You're different and most places think that's a good thing. I think you can put together a very competitive package. Be sure to explain "why medicine" in the PS and you'll be good to go! My prediction is that you will have great success in obtaining interviews this cycle.
I hope this helps. Feel free to write if you have other questions.
Good luck,
Gator