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first test, i have a comment about amp restriction and inductive reactance

~1000 Hz , 1.3 amps

~2000 Hz, 1.1 amps

~3000 Hz, 1.0 amps

~4000 Hz. 0.88 amps

~5000 Hz, 0.5 amps

~6000 Hz, 0.17 amps

~7000 Hz, 0.11 amps

~8000 Hz, 0.08 amps

~9000 Hz, 0.04 amps

~10,000 Hz, 0.02 amps

~11,000 Hz, 0.01 amps

drawn from power supply, the chokes are restricting amps!

inductive reactance = 2 pi f L

Congratulations!

Did you measure the volts on the cell at 11khz?

Steve