For what it is worth, I had less clinical experience than you and I was accepted to five programs and interviewed at two top ten schools (my stats: 3.98/ 38/ 4 years research). The only clinical exposure I had was shadowing two physicians for one day each, volunteering for a day at a children's hospital, and volunteering to check patients in at a free clinic about 4-5 times. Or basically less than 50 hours I would imagine.
Definitely put down your planned summer work as an activity on the AMCAS application. It is perfectly acceptable to mention a future experience, just make sure you do it! My free clinic work was a "future" activity and it worked just fine on my AMCAS. The most important things really are your research experiences, GPA/MCAT, and letters. The adcom really just wants to see that you have tried to step foot in a hospital/clinic and will not run screaming from your first day on the wards. As long as you speak passionately about medicine (and research) in personal statements and interviews, I think the experiences you have so far clinically (and with your great stats!! A 37 MCAT is awesome by the way... like 98th percentile at least!) will be just fine. Apply broadly, but I do not see why you wouldnt get some great interviews!
Also, consider making appointments with your letter writers to explain in person your desire to pursue the dual degree option... A lot of people (especially strictly PhD or MD folks dont always understand why in the world we would ever want both degrees, or do not want you to go in to this without a plan B option). My biology research advisor (PhD only) sent me an email telling me that getting in to an MD/PhD program was like trying to be an astronaut and that if she was my mother she would want me to have a back up plan. What really was going on, is that she did not understand why I wanted both degrees and had not ever really listened to me explain why this path makes the most sense... so sit down and talk with your mentors! You too can be an astronaut haha 😀