I have 170mm on two road bikes, 175 on a road bike, 172.5 on a gravel bike, and 180 on a touring bike.

The 180s are fine, don't love em or hate em...i think they feel different but can't tell if it's me wanting them to feel different or actually feel different.

In theory, the 180s would be great since in 6'5. I really dont care either way though.