Impedance matching for this circuit is not what would expect. If you attempt to match impedance with the measured values if capacitance, and inductance as shown in the schematic, the circuit will never reach the resonant state with the peak voltages found, or current values shown in the diagram above. The impedance shown is the result of a LC phase variation that as a result of resonance, and impedance matching wound up 180 degrees out of phase. When the tank circuit was cold it acted as a short, or a near short circuit as a load on the oscillator. When the impedance of the oscillator is lower than the tank circuits starting impedance the phast shift produced a high impedance load in the parallel tank circuit. The starting impedance equivalent reqired to produce the output shown involves only the values of inductive reactance, and capactive reactance as if they were only DC resistance values in parallel. For example, I could have 1 kilo-ohm of AC resistance as a result of a starting impedance of 5 ohms, and until the circuit sees 5 or 10 cycles at the right frequency, and starting impedance it will not approach resonance at the peak voltage, and current values shown here. At about 100 cycles resonance will be achieved. At 100 KHz, that's only a millisecond but, if the oscillator doesn't have an output impedance that is less than 5 ohms resonance will not have a peak voltage, or current that is equal the input voltage, or the current traped in the tank circuit as shown in the diagram.
In order to properly tune the circuit, a signal must be injected at a matched impedance value stage per stage at each stages resonant frequency, even if it's a chaotic resonant circuit. Starting at the final transformer output stage you find the resulting current, and then divide the volts by the amperes to find the resistive equivalant of that tank circuit when it's operating with the planned resitive load on the output. A load resistor is used for the secondary that is equal to the value of the acutal load for the sake of tuning the primary circuit. The next step is using the value of impedance on the primary that results from resonance for the next stage, and this includes using another load resistor that is equal to the value of resistance that is found based upon the measured values, and impedance equivalence calculation. At this point the process is repeated working towards the input one stage at a time until the oscillators input stage has been tuned. Finally, since this is a power supply circuit, the oscillators frequency is fine tuned to the minor difference that component values may make impractical as operating frequencies. Although, anywhere around 100 KHz as a target frequency is ideal.