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in mu experience power doesnt appear to be a significant factor as much as frequency accuracy, penetration and chemistry are.
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From my tests and results (sensations of worms moving to avoid the current, and objectively measurable die off in the phlegm and in the feces), the intensity is an important factor.
I agree with you that the intensity is not the only important factor. The intensity and the right frequency (and the square waveform ? and the 50% duty cycle ?) seem to be the best combo to kill helminths, i don't know about others single cell organisms but i think they can be killed even more easily.

I don't understand what you mean by penetration because if you are talking about the ability of the current to penetrate inside the body, then the output voltage, the contact area of electrodes on the skin, the wetness of the skin, are important factors to take into account so that the resistance of the skin is low enough and so that a high enough current is able reach the blood/lymph and others "conductive" areas of the body. So power and penetration are linked and penetration and body chemistry are also linked.

What i have found is suprising and contrary to what many people claim on these forums. The lower the frequency, the more it causes damage to helminths (of any kind).
I can objectively measure this by the die off it produces.
Using the specific frequencies of helminths published by Hulda Clark , even with 30mA intensity seems to be useless and does not produce die off, or very little...

However, the problem is that the lower the frequency, the more difficult it is to take a high enough intensity because it is painful for the tissues/muscles.