That is entirely up to preference.
Technically speaking (as someone who works for an Audio/Visual company) the standard, flat settings are the proper settings to use. Mixing technicians get paid large sums of money to mix the audio properly, adding your own mix on top is defeating the purpose.
If you really, truly need to mess with the audio, you will have to find your own settings.
Not to mention the Kraken series (and pretty much any Razer headset) are not exactly quality.