The thing I really did not like about the original Variax Piezo's was that they relied on contacting the strings for their grounding. Every once and a while I would get a bad connection with associated hum. The Ghost piezo's have a ground wire on each one which I connected to the flex ground in the Variax 500 bridge. No hum and far more output. I had to turn the string volumes down to about 50%.
I have not looked at the JTV piezo connections to see if they are grounded individually the way they should be.
This. I had so much grief with my Variax when I got it cause a few weeks after I got it, the D string piezo went out from bad ground connection.
I fixed it by putting copper wire between the piezo and saddle, but I tried pressing it in further to make sure the piezo was in as deep as it could be and I ended up breaking the grounding. I tried taking it out and accidently broke the signal wire, and the piezo was ultimately unusable now.
LUCKILY I bought a new x-bridge piezo from LR Baggs (Piezos were out on Line6 and there were rumors of them not stocking them back up anymore)
And I soldered the new piezo's wire to the old piezo's wire.
Works great now. No more signal going out when I use the whammy bar.
After that, I freaking love my guitar.