Try getting away from offset mode and due fixed voltage. Its much easier and far more common. Once you get your fixed voltage you can use that number to go back to trying to tune for offset anyway.
Try fixed voltage of 1.25 and 4.2GHz. Set LLC to level 1/high or even 2 or 3. Give that a shot & see what happens. You can then tune clocks and voltages from there to achieve a higher OC if desired. That chip should be able to reach upwards of 4.5 easily with good cooling and reasonable voltage. I personally try to find the best OC I can with priority 1 of keeping voltage no higher than 1.3v and of course keeping temps comfortable (80-82c max under the most brutal stress tools like the newer versions of prime95 which over-stresses the...