GF, unless you have an ignition coil the produces the equivalent of a lightning bolt the spark is only going to jump to the point of least resistance regardless of how many ground electrodes are presented to it.
Well I ended up doing my own 1K mile service. She runs much quieter, smoother with all synthetic. My clutch seems to shift better too. I still need to adjust my throttle cable as it has too much play at idel (wiggle, wiggle).