Overclocking settings for AMD phi2 mining

Hello,

I began mining LuxCoin (phi2) with my AMD cards and teamredminer.
I am mining with 2x RX580, 1x RX570 and 1x RX560 for a total of 16 MH/s and 290 W.

I don't know the good overclocking / undervolting for a maximum profitability. I tried some settings I met some problems like a GPU stops mining after several hours (and I must have increased voltage of some GPU).

My current OC settings :

RX580 : Core = 1120 MHz / 830 mV ; Memory = 2000 MHz --> 4.8 MH/s
RX570 : Core = 1100 / 820 mV ; Memory = 1960 MHz --> 4.2 MH/s
RX560 : Core = 1100 / 840 mv ; Memory = 1950 MHz --> 2.1 MH/s

My full rig consumption is 365W (~70 W when I am not mining)

Does someone already mine phi2 with AMD cards and could help me for OC settings and get the best profitability ?

Thanks