Try:

Cclock (core clock) 1320
Mclock (memory clock) 1800
Cvddc (core voltage) 750 or 775 or 800
Mvddc (memory voltage) 780 or 800 or 824 or 850
Memory controller voltage (in HiveOS) 1280 or 1300

Don't touch power limit>You will still make around 52mh but on lower power consumption.