Smoothing Supply

I am using one of these XP Power SMPS to run the Arduino that controls my setup, I have been having some issues that may or may not be related to the SMPS. I thought smoothing the supply couldn't do any harm but as I know very little about these things I was hoping somebody could recommend the most appropriate configuration for the smoothing

The manufacture says the maximum capacitance the SMPS should see is 550uF, this maybe overkill but what would I know. In the reading I have been doing it seems that having a resistor involved is a good idea, but calculating the correct value is a complete mystery. I imagined a RC or a CRC is probably what I am after. All suggestions would be greatly appreciated.
 

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