Yes, 415H is significantly thicker than standard 415. It would take some work to fit in the average chinagirl.
Some chinagirls don't even like regular 415, some need grinding work just for that. Some kits have come with 410 instead.
And really, 415 is overkill. A high-quality chain like KMC Z410 is plenty, as long as the chain run is perfectly straight.
I don't think OP was talking about a chinagirl, tho, was he? After all, he used the words "70 MPH" and "peace of mind".
No one who is truly wise would use those words when thinking about a chinagirl. It's an oxymoron.
Or a pun, depending on how you look at it.