Hi award winning Andrew,
The post by Kandyman to which you've replied is 15 years old and that member was banned a long time ago.
To answer your questions, I don't believe it's known what the readings for tests 1.6 and 1.7 mean as they're not mentioned in the original BMW document on which the information is based.
My VIN number is also one digit longer than the reading in test 1.0!
Simon