I had a similar issue, mostly on G string and B string as well. I changed the nut for Graptech Nubone and changed the Bridge for Gotoh and now the tunning is all great, the only issue that i have is that the tuners have these keys and they rattle from the vibration of the strings, but its only noticable when playing unplugged. When plugged to the amp you cant hear it obviously and also it doesnt affect the tone whatsoever.Nice guitars. I’ve had mine quite a long time now and the tuners need replacing. The original white has faded to a cool cream with a tinge of green. The gold hardware has also tarnished in a nice way.
It still plays great other than the tuner slipping…
Good to hear you got your issues sorted! Mine is definitely a tuner problem, you can see the actual tuner seems to be coming apart!I had a similar issue, mostly on G string and B string as well. I changed the nut for Graptech Nubone and changed the Bridge for Gotoh and now the tunning is all great, the only issue that i have is that the tuners have these keys and they rattle from the vibration of the strings, but its only noticable when playing unplugged. When plugged to the amp you cant hear it obviously and also it doesnt affect the tone whatsoever.
So i gave up the idea of replacing the tuners