well it all depends on how much W can your cards get. for example i have rx 570 where is limit 117W and despite i set anything, 900+mV it all the time hit the wall 117W and start lowering Mhz. so in this case maximum for me is 2,7xx for lyra2z (havent tried phi2). however when my card has higher W limit, im able to reach 3,1xxMhz with rx570.
Which card model have lyra2z 3.1 Mhz/s hashrate ? I have RX 570 4Gb, Sapphire, Aorus, Expression, KFX all max = 2.85
I try install HiveOS, Make Gin wallet, connect to pool my 5x RX 570, and BOOM in my 750W ATX Supply...

I change Supply, disconect 2 GPU , restart lyra2z GIN, on the wall 580W with 3 GPU..... i must change in settings core V to 950mV, then is 400W with 3 GPU....
I dont know how is this possible.... all GPU have bios with 950mV core..... be careful with HIVEOS and lyra2Z...
PHI2 have 4.3 Mhz - RX 570 4Gb, ( PC, 3X GPU = 410W in the wall )
Just in case you haven't realised, there's a new software that's being distributed by the user @svedr, (
https://bt.irlbtc.com/view/5039398.0) it works for AMD as well, and is 20% faster, which means your RX 570 can hit 3.1 MH/s with your own software. if you forgot that you wrote it (or at least the thread that you started), it's build version is 0.01
I believe it is running very similar code to this MountainMiner which you tried probably 2 weeks ago.
(hint: you might got your account hijacked and your hijacker is using the same credentials as you are now still....)
Back on topic, you are using 5xx RX 570 with a 750W PSU.....that's brave and kaBOOM is well...at least lucky nobody was hurt.