Your experience with SDS is good because it shows caring and compassion for peers with disabilities in your community, so that's a keeper! Likewise with the experience with children, because it's one thing to say "I want to work with kids!" and another thing to actually know what it's like to do so. As far as research experience goes (including conference presentations), I'm pretty biased but I think that schools will want to see that. Is it in psych? If so, psych and CSD are pretty closely related, and research success in one often indicates potential success in the other. I'm not sure if you're interested in pursuing a research career, but any clinician who's research-oriented will do well with diagnostics and will probably be better at implementing evidence-based practice.
I'm saying these things as someone who's still an undergrad, so take it with a grain of salt... But based on the feedback I got on my resume and applications this year, that's the advice I would give you. I think you could argue that your extracurriculars are actually very well-suited to the field It looks like you're application is gonna be awesome, congratulations on that!