Thanks Richard, for doing this work. Do you have a website where some of this information is stored? I would love to read a chart that compares various jackets showing number for CFM, HH and weight. Better yet, it would be nice if Backpacking Light did this. Unfortunately, it looks like they would have to do it every year, as they seem to change without warning. I think it is crazy to see how often the makers change their jackets without changing the name. It is getting be to like car models ("a '70 Firebird is nice, but I like the lines on a '69 better...).
Both rain jackets and wind shirts provide a certain amount of water, wind and bug resistance. So far as I know, all of them work as a mosquito barrier. As stated elsewhere, there is a direct inverse relationship between a garments wind resistance and breathability. The more breathable, the less wind resistant, and vice versa. Given that, I can understand why companies sometimes make their wind shirts more wind resistant and more waterproof. Many of them sell them as the one shirt you need (for all of the elements). I personally wouldn't trust any wind shirt as my only rain garment (for backpacking), but I do appreciate the value. For me, I will always take a rain jacket.
Given that, I want my windshirt to be on the other end of the spectrum. I can always throw on my rain jacket (which is not as breathable) if things get really windy. But if I want an extremely breathable layer for bug protection, or mild wind, then it is nice to have that option. This is why it is frustrating when makers decide to change a garment that served that purpose so well.