Original edge, knife edge issues?
I say knife edge issues with a ? as this is only an amateurs guess really. I bought a brand new JEM70v (don't hold it against it) recently, plays well, holds it's tune... unless you use the whammy bar.
If you dive the tuning goes flat, if you pull up, the tuning goes sharp... if you play with the whammy til the E in in tune, then everything is in tune again. So this doesn't seem to be problems with the nut etc.
If I leave my action at stock height - tuning goes a tiny bit flat/sharp after whammy use, so little it's actually barely noticeable unless I have my tuner up. However if I lower my action, tuning goes ALOT flat/sharp, a full tone + and -.
So I put this down to my knife edge... I took the trem off and lubed up the KE's with whatever I had around (Chapstick). This did nothing.
Could a brand new edge need sharpening on its KE's? Seems crazy. Any suggestions appreciated.