--which were originally set at the 5th and 95th percentiles of a large group of non-neuropathy sufferers of varied ages through the MacArthur protocols at Johns Hopkins (which is basically where skin biopsy for intraepidermal small fiber density was invented) is considered to be evidence of small fiber neuropathy. (You can look at the original papers if you search for "MacArthur small fiber" at PubMed.)

The determination of "mild", "moderate", or "severe", though, usually doesn't involve these numbers, but more the perceived symptomology of the patient, as there is not a direct correlation between the numbers and what the patient is objectively feeling.

Nevertheless, you're pretty low on the scale, so you can term it severe neuropathy if you'd like--and certainly your symptom profile would match that