Lots of info guys! thanks for all the responses. working on the position, i did a first ride with the new bars. Right now it is a lot too stretched out, so i am picking up a shorter stem from a teammate. Then i can start fiddling with the bar itself to get to a good baseline position. In the position i am definitely focused on a good turtle, sadly my shoulders are rather wide so getting a narrow shoulder position wtih low head will give me the best aero gains i think.
helmet will follow once i settle a bit more on the position, for now i will just keep riding with the Giro selector i already have. it's a bit oldschool with the long tail but don't want to start changing everything around at once.