I have experienced the vincristine parasthesia personally when going through chemo 16 yrs ago.
I was unable to change the condition until the chemo was ended, and then it took a couple of months to recover.
I hope that your client is doing well?
Tom
I have not seen this condition myself, but am questioning why you are stimulating the plantar flexors instead of the dorsi flexors? I would think a heel switch for the activation of anterior tib would be most appropriate for gait.