Ultra Light Strings and tuning down a half step? And I imagine you want the lowest action possible. This is the reason why you’re getting buzz unless you play with the lightest touch. You’re essentially wanting an acoustic guitar to play like an electric. If that’s the case, you’d be better off with a Fender Acoustasonic.
It’s possible (anything is possible) that the Guitar Center repair monkey filed the nut slots too deep. But I’d start with getting used to playing .12s (a Southern Jumbo will sound better with strings heavier than .11s) and go from there.
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1959 Martin 00018
1998 Martin OM28V
1918 Gibson L1
1972 Gibson SJ Deluxe
2019 Gibson J-45 Standard
2022 Gibson 1960 Hummingbird Fixed Bridge
…don’t even get me started on electrics - too many to list.
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