The ground electrode serves as a saftey zone for parasites. Therefore, not all are killed. Keep the ground electrode only in the hand and away from the rest of the body. You should note a difference.
Is this covered in the book? I pick it up to read only every so often because I got so fed up with the UZ. Just recently giving her a go again.
The book is incredibly well written, incidentally. When I've finished it, cover to cover, I'm sure I'll be much more able to make sense of what I can't now, and will be sending out further accolades.
On a personal note - my condolences to you w respect to the events in your life a year ago. (Not sure how to better put that) I was reading the book the exact day of its notation. (Remarkable/coincidental in itself) The book is quite a work in honor of.