Took a break then headed home in reverse...
Never mind - I'll just leave you all to fill in your own punchline here...
The downfall was the K81 only lasted something like 18 to 2,000 miles. After that I went to a 3.50 K70 on the rear and they only lasted 2 to 2,400 miles. I went thru 6 of those and 2 front K70's.