Glow rope made a return for just the heel section.  This didn't cause any problems & was easier to adjust the tension on.  Something must be done about the rope wear.  Tried the toe knot again & failed.  If it didn't come undone on its own, it was real painful.  6.4 miles later, the soles were deemed worn down enough to discard.  They lasted 25 miles, but there should be a test to destruction. 

Gradually increased the speed up to 10.9mph.  

It was definitely easier than shoes.