It's definitely not overkill if it gives you a peace of mind.
Hard ear helmets are not my cup of tea but my son swears by them. I'll occasionally take one of his for a few runs, feels strange at first but totally forget about it in a few minute.
If you get hot with it on, then just go faster. The air flow will cool you down.
I get your thing for speed. I have that need for speed also. As I age, I seem to get more fun from the abrupt g forces generated in the turns. Pure raw speed is now a bit less important.
The last decade or so, saveuring the weightless and time dilation feeling during the transition float phase been the kicker for me.
Have fun, stay safe and God speed.