The best possible situation/environment when using Electric Touch Plus is when the user is grounded. So being on the second or third floor will decrease its power. Also be sure that they use insoles, this will help them a lot! If they want to increase the conductivity, they can purchase conductive foil tape and put it on the bottom of their shoes.
This can really increase all aspects of your performances. It really is like having superpowers running through your entire body. You can send an electro static shock at any moment increasing the power of your effects.