water dielectric would fail with ac with half the voltage it would need if dc.
your theory lack of circuit explanation. What you call 180° i don't believe really is. is simply the opposite polarity.
I think you could achieve that but only with a pair of wfc... don't get limited to the way stan did, try other ways you will learn more about how things work.
For example get a full wave driver and apply 20 volts across the cell and observe the current as you vary the frequency... There is no way to calculate the resonant action frequency only experimentally you can find it.
I believe meyer constructed the variable spacing cell for testing this...
There is other possibility the inter-winding resonance, i mean between each turn, something keeps blowing my mind, an experiment i made where i burned a transformer into light cause i reached this resonance... it was around 200khz... however i'm not sure. It could be that this kind of light was corona discharge all over the transformer...
If you can have many turns in resonance in series you would have a giant high voltage in the end line... I read about it sometimes, and i think that this destructed my transformer... maybe increasing the linearity of the windings you can get all resonating at the same frequency and increasing the capacitance by maybe putting the coils under oil...
18 turns to 36 turns thick