First off, save current settings as a default profile. So you can reload them, should something go wrong.
Keep the Default Kraken and don't changes its tunables just yet. Change the CPU Min Freq to Lowest value permitted and the bring down the Cpu Max to 1 step bellow the G3 stock 2.5 GHZ. Then Undervolt across the board by 20 mV. (In other words, reduce the voltages for all Freq Steps by 20 mV). Make all the changes to stick at boot. Save the profile yourself. Reboot and observe the overall behavior.