The CoolSculpting machines are set at a specific temperature for a specific amount of time to keep the treatment as safe as possible, while still killing the fat cells in the treatment area. This is something you should have done with a Certified CoolSculpting Specialist and should not be attempted at home.
I'm not sure where you found the numbers that you used in your question i.e. -5 versus -10, but both of those numbers, whether Fahrenheit or Celsius, are not appropriate. Fat freezes at approximately 4°C and 39°F. There is no ability to set the temperatures lower on the CoolSculpting machines (at least that I'm aware of) and of course the FDA approval was based on the company recommended temperature settings and time of treatment. Overlapping areas that have been treated has been shown to increase effectiveness and we do this frequently in our practice. Dr. Adrienne Stewart MD FAAD