If you make a 30+ on the MCAT, apply this year. Your gpa and strong science background (including your ability to handle such a hefty courseload in the sciences!) shows that you can handle med school, and the 100 hrs of shadowing show that you've seen what doctors do and you're still interested, esp. if that shadowing was with multiple doctors from different fields. Clinical experience is a must, and can be a dealbreaker for certain schools, so get a job (volunteer or paid) where you actually deal with patients ASAP (like, now) so you have something to talk about in your secondaries and interviews. By the time schools start making the bulk of their acceptance decisions in winter, you should have a few months of clinical/patient experience under your belt to show for, and that should be enough, given your stats. You shouldn't have to wait a year.
Good luck!