Well, after this Circuit above it looks like a standard Bedini Circuit, as most use it,
only with a extra Diode from the negative Terminal from the Load back to Plus.
I had the same Setup once too, but could not say it made something very special, then I did take the second Diode out from the Load,
because of the backspike, what goes into the negative Side from the Load/Charge,
but maybe your 'Trick' happens someone else too, may the core-less Coils or the right Frequency at oscillating it.