Thanks all! It kinda feels like I didn't say enough about the B, but there were no issues and she performed like a champ. Such an amazing bike!
I've got a friend with a Harley who talked about high altitude performance differences when going through the Rockies, will have to break the news to him that I couldn't feel any difference on the B.
My stock rear tire is all but gone at 7500, but I could see it coming.
I tried to keep it within 5 of the limit, didn't get any tickets, but there was this one stretch in OK.... I can safely report that the B stays stable at high speed.

OldTymer, that Woot bag is staying on the bike til I can get a proper backrest! Wait... Maybe that IS my proper backrest?