You could be using too high of an intensity. I've read several books that discuss energy therapies including Rife and PEMF and all the experts say that weaker applications are usually more effective. The max I tend to run contact sessions is 10V and very often usually only do 5-8V. This is with the amplitude ramp up/down turned off. If you have the ramp up/down clicked, the Spooky software will automatically adjust the settings lower and if you are still having pain or lingering tingles, you may need to further reduce the intensity. If you are running killing programs, there is some logic to using a higher amplitude but if you are doing healing or detox programs, max of 20V may not do much good at all.
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