We tried our third test roast of this coffee today with an end point -5 degrees F on the first roast (the second test was roasted at the same time as the first roast, being +2F than the first and this 2nd test was quickly dismissed as being out of range).  Now that we have a taste for this consignment we were able to fairly quickly conclude that even this third test roast is over done.  The next test will be 8 degrees F less than this one (-13F on the first test) to probe low and see where the bottom limit is.  We may then have to step back up but we dont feel we know where the lower limit might lie yet.  More soon.