Definitely too large in that area I wasn't expecting it to be that large as I've tried their CR size 40 and that was large...
I like the length and around the bottom, perfect. Sleeves are ok apart from the top side where they get too big for my taste and the back is just massive. The measurements were alright, I think p2p is actually bigger than it was on the website as it says 21.25" but looks over 22.
It would be interesting to know how Aero is measured. I have the impression that, especially with P2P, the actual dimensions are always larger than stated. If I look at the dimensions for a size 40 on the website, then almost all of them have a P2P around 22.25"- 22.5". On the other hand, on the Thurston website, almost all size 40s have a P2P of 23"