Great work John!
I'm wondering if the main 100khz sine wave could be smooth but aspects of the plasma are manipulating it. For example, there are all sorts of anomalous currents being generated in these devices. The Correa's described their system as a DC to AC inverter in that a pulsed DC input produced two outputs both in the forward and backwards direction. I'd also suggest that someone take a look at Harold Aspden's "Law of Electrodynamics" which might explain some of the current surges in these systems.