Thank you for the detailed explanation of the criteria for your ball head ratings and tiers, it's very informative. I have come to expect no less from Nikonians thanks to you, Neil, and the other moderators and members.
I have been very happy with the performance of the BH-1, however, I shoot as a hobby only so I probably do not use a ball head to its extremes. One reason why I went with Kirk products even though they are not always rated "number one", is they still have a well respected reputation and they are made in the U.S.A. These days we don't make very much anymore and I wanted to be supportive.
I was reading the Nikonian ball head article you linked to in an earlier post. I believe Kirk must have updated/changed some of the specifications for the BH-1 since the article was written.