I don't typically watch a lot of bicycle racing but have noticed that some riders setup their brake hoods to be angled inward a bit.
The following video goes into this bike setup "hack" and although not a scientific study, claims the setup is more aero than how we normally setup brake levers...
Have you/do you have your brake levers angled inward?
I typically setup my levers to be "straight forward" which is perhaps not the most ergonomic setup for my wrists. However, I'd have to think that if angling one's levers inwards was somehow more aero and obviously free to implement that everyone would be doing it.