I am in the exact same boat as you, I wear 9.5 shoes. So on my trick I run a medium sync without the elastic laces because I like to run that as tight as possible and have only released once. On my slalom I run double syncs both in large and I am very happy I am running a large on that. I have ejected on some OTFs that if I would have been in a medium I'm confident I wouldn't have released and injury probably would have occurred.
Sizing on Connelly Sync Bindings
in Skis Fins Bindings
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