Does high altitude affect harmonica performance?

I was at Big Bear, ~7500 ft altitude, yesterday and started to play my Seydel tuned in LowC… The harp seemed “leaky”. It took more air to make the reeds move.
I can understand how the physics would make less dense air, less viscous and change the performance of the reeds .
With all the amazing tunings available out there is there such a thing as a “High altitude C”?
Has anyone else ever noticed this or am I the only crazy person here?

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