The BB crossing are more like 8K to 9.5K. The Santa’s Village Crossings are in the 9 to 12K range.
It’s been my experience that commercial jets tend to appear 3-4X closer than they actually are.
GA aircraft are a different matter and I’ve had a few encounters that I wish I hadn’t. The fatal Cessna in TX is more like a fat GA aircraft about the size of an Elsinore jump plane.
Thanks for the reality check by running and uploading those tracks!