Poncho, looks like your down to the wear bars in pic#1. I too like to get all the miles i can out of a tire. They do seem to track poorly when they get to that last bit if tread. I put Cobra Chrome tires on this year. If i get 10,000 miles out if the back one that's ok because i got a goid price and $ 60.00 rebate. Tires have improved over the years but 20,000 miles would be great.
Directions ? That's only the Manufacturer's opinion of the way this should be assembled.