I've heard med school like longevity working at one organization. So that helps that you have stayed committed to your volunteer positions. I don't have too much more volunteering than you and I honestly think it is sufficient. As long as you can comment on what you have learned and how you have helped, the experiences you listed are enough. Some people have ridiculous volunteering and I applaud that, but it's not necessary for med school. It certainly helps them, but as long as your numbers are good and you have other activities (research, work, leadership, etc.) you're fine.