All I can add to this is that my Collings are less sensitive to RH than they seem to be to temperature.
They've been fine all summer with an RH of 50-60% and temps in the low '70s but since I switched the central heating on, whilst RH stays the same, night-time temps get lower (naturally)and high strings all start buzzing (although I like higher than normal actions).
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Silly Moustache,
Just an old Limey acoustic guitarist, Dobrolist, mandolier and singer.
I'm here to try to help and advise and I offer one to one lessons/meetings/mentoring via Zoom!
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