Bfr luke tuning stability

Bfr luke tuning stability

Hi, wanted to throw this out there and see if theres any recommendations.
i have a 2015 bfr luke blueberry burst. main guitar for 3 years now. its absolutely incredible except for 1 thing.
I’m having trouble keeping it in 440. Its been set up and intonated by guitar factory in orlando. bill does incredible work. bridge is flat on the body, intonation is perfect, I’ve put graphite in the nut( helped, but didn’t solve). is there anything I’m missing? am i suppose to oil the locking tuners? neck is straight, you name it. very well taken care of. just baffled.
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