I replicated your findings. interesting indeed. I had a small bifilar coil from a previous experiment. core was some old nails. Im no expert using my scope yet, I have only had it since christmas. But my wave form changed. From the standard H wave to a slight H wave but with a considerably large negative spike before to positive H spike.
My current draw only went down maybe 10 mA. But the wire I was using was 26 ga. I was able to produce some Voltage in this config. The neon does light even though it is connected to charge battery. So i decided to try and utilize the transformer action of the bifilar. I put one wind of the bifilar in series with the output of the SG then to the charge battery. I used the other side of the bifilar to a cap. I could charge up a 50V 100uF cap almost instantly. I blew a small 12V auto bulb instantly off the cap. charge rate stayed the same throughout the experiment. SG did not slow down throughout the experiment either.
My current draw only went down maybe 10 mA. But the wire I was using was 26 ga. I was able to produce some Voltage in this config. The neon does light even though it is connected to charge battery. So i decided to try and utilize the transformer action of the bifilar. I put one wind of the bifilar in series with the output of the SG then to the charge battery. I used the other side of the bifilar to a cap. I could charge up a 50V 100uF cap almost instantly. I blew a small 12V auto bulb instantly off the cap. charge rate stayed the same throughout the experiment. SG did not slow down throughout the experiment either.