This come down to me cutting an inch from my backsight but I should have cut 2.  Maybe you put the 15mm & 9mm together and come up with 1".  Yes, my instrument was 1" higher than I thought putting my results 1" lower than reality.  I'll give the show and tell to anyone who cares.  My apologies to anyone fretting over this.
However, we are still 9mm high which is closer than 15 but still a lot and maybe too much for HEPI.  We are now waiting to hear from ISC to learn what they can tolerate.  See aLogs 4223 & 4242 if you need.