Ordered my first pair of Birkenstocks and now upon receipt I am not sure about the size. I'm generally a 10 in say Buttero or McNairy, definitely a 9.5 Alden Barrie last. So I ordered a size 43. However I feel like they're a bit big. Bottom strap is to the last rung while the top strap is to the second to last rung. Length doesn't seem off. Just wondering if anyone has experience and what rung they're on. These are the basic Arizona suedes.