First off, I think you might regret trying to complete secondaries for so many schools. The quality of your writing may suffer when the avalanche of secondaries come in and you're trying to turn them around. With your stats, I think ~32 schools should be more than enough.
On the clinical volunteering, is that 520 hours total or 300 ? On the non-clinical volunteering can you explain a little about what you did ? This might be a weak point given it was remote.
On the school list, yes, a little top heavy. I'd probably think about where I'd really like to go and apply to those elite schools, drop a few, and fill in with some more T30-40 choices. All in all though, not a bad list. Congrats on that MCAT score.