I'm not Kitt, but I would say it isn't necessarily CMT. Even as a child I couldn't really run, and I certainly couldn't run even a few steps now. I think the cement feeling may be from the SFN, the muscle weakness and wasting is a CMT symptom. My numbness did start in my toes, but in 14 years it has progressed to my knees.
How do you line up with other CMT indicators? Difficulty in walking uphill or up stairs (and eventually down stairs) is an indicator. Is your PN idiopathic at this point?