I use the original Solution Speed but am not sure what size to order in the new model. I could probably use a slightly shorter shoe but want to keep most of the width. The pair I have don't feel "clumsy", but I could definitely go with a slightly more snug fit. So; if I go down one size, will that do it for me? I have the Gel Challenger 9 one size smaller than the Solution Speed, but that one is too short.