It seems that you lost in the binning lottery.
Once you go past 1.25v, heat rises rapidly. Superb cooling does little and is not much worth it.
Set vcore to 1.25 and adjust the multiplier gradually until you are unstable and then back off a notch.
Leave BCLK alone.
OCCT is a good test vehicle.
4770K is a fine cpu; do you really need more?