Help Me Nerd-out for a Course Record

Hey all, I need some advice on a super pointless equipment choice for a Fondo tomorrow.
I’m doing a 100 mile course tomorrow and trying for the KOM/course record. I have the record for the two old courses (they moved the route in 2019 and I haven’t done it since) but not this one.
I’ve optimized all my equipment for the route…except my helmet.
For all of you who like to obsess over tiny details, which helmet option do you think will give me the best results for the given course-vent covers in or out? Let’s take cooling out of the equation for this. I have one vent cover in now for anti-bee-in-helmet protection.
Let me know your nerdy suggestions!