Sorry for being so late in replying. I was out for much of the weekend.
As for the TENS type pads, they do not appear to work nearly as well as the copper electrodes. Just keep the copper off of the skin by wrapping the electrodes in a paper towel wet with salt water or Epsom Salts
Yes, 30 kHz does not appear to work so well for fungus. There are a number of lower frequencies that appear to work much better. I like 464 Hz, 886, 866,414,254,412 Hz, etc.
No such thing as perfect though as there are always individual variations, even with microbes.
As for the head area, I always recommend caution. I have zapped the jaw areas and even the temples and forehead but always pay attention to even the smallest noticeable difference, including closing my eyes and then applying the paddles, observing if there is any light generated which could indicate electrical current through the optical nerve.
Putting both bars on an area is actually not good. The negative electrode actually protects any parasites
that are near it. For that reason, the negative electrode should only be in a hand or under a foot.