Don't be fooled by buzzes that 'seem' to come from the bridge area - I had a 'bridge area' buzz on my HD-28V which proved to be nothing of the sort - it was a loose tuner-washer!
Questions - are the new strings a lighter gauge than the old ones? If so, you might need a 1/8 to 1/4 turn to back off the truss-rod and give you a touch more neck-relief. You could try that anyway, just to see what happens.
Have you checked that all the screws and bushings on the tuners are tightened down sufficiently?
Is the saddle getting grooves worn into the crown? Sometimes, a groove can create strange effects in an individual string.
TBH, though, if it was my guitar, I'd take it to a good guitar-tech for a full set-up (relief/nut slots/saddle) and check over. Not expensive, and might save hours of faffing-around and frustration that would be better spent playing a well set-up guitar!
The usual disclaimers apply......IMHO, YMMV etc.
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John
McNally OM-32 (Sitka/EIR) (2024)
Lowden F-23 (Red Cedar/Claro Walnut) (2017)
Martin D-18 (2012)
Martin HD-28V (2010)
Fender Standard Strat (2017-MIM)
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