OK...I'll apologize for the length of this post up front.
The only nagging issue I have with my JTV69 is as follows:
Problem is limited to all the drop D tunings (drop D, drop Db, DADGAD, open D).
I pulled up Lester-1, and I brought the A string volume all the way to zero. I then played just that string, carefully muting all the other strings down by the nut so nothing else would start ringing, also being careful not to touch anything with my picking hand but the A string. As expected, total silence.
BUT...as soon as I layed the palm of my picking hand across the rest of the strings, (normal palm-mute, "chugging" position) playing the A string now produced clearly audible notes. With that string's output at zero, the only possibility that I can see is that enough vibration is being transfered through my friggin' hand that is then propagating along the low E string to that piezo saddle (possibly others as well?). I suspect it's mostly by the low E saddle, because one's hand will rest mostly on that string almost by default, when palm-muting anything...mine does anyway.
It explains why this is only happening in the drop D tunings...when I palm mute and play the open A string, any resonance being grabbed by the low E saddle is then being detuned, and this has to be what's bleeding through. It also explains why it does not occur in any of the other tunings...in those cases, the low E piezo saddle is probably still picking up resonance from the A string, but since its not being detuned, is passes through unnoticed as the same pitch.