I believe you want to charge up the cell using voltage LESS THAN what is needed to achieve electrolysis. This is the only way to get a charge on the cell. Once the cell is charged, only then should the high voltage pulse hit it to liberate the charge. If you keep hitting it with +electrolysis voltage, that's all you're going to get. The coils should be opposing reach other and tuned appropriately. This limits it to charging as the fields cancel each other out. If tuned right, this also helps keep the initial voltage low. This would start the process. Once you get the cell charged to where you want it, then up the voltage and retune resonance to up the voltage so high spikes crack all the water that has already been charged below electrolysis voltage.