Situation:

We are no experts miners..
First we used 6 Radeon RX 580  GPU's (mixed brands) with Ubuntu as OS and Phoenixminer 5.5c as miner for a while.. Then we added a 7th 580 which came available and with no hussle we got it running. I have been busy to get the best settings for each card and got decent hashrates..

Now we wanted to up the hashrates by replacing the 580's GPU's with RX 5700 XT's one by one.
But for some reason we do not get the first one to be recognized in Phoenixminer.
It shows in the PCI list of Linux..

To make sure the 580's would run kind of optimized and since I do not know yet at what GPU number the 5700 would be get by phoenixminer, I wrote following lines in the config file:

-cclock RX*580:1150
-cvddc RX*580:850

-mclock RX*850:2175
-mvddc RX*580:860

As I understood from the help for the config file this should set the core/mem clock and voltage for all GPU's that are named RX AND 580 with the specified numbers.. all other cards (the RX 5700 XT) should use their default.
But when the miner is started the settings are not used and the RX 5700 is not displayed and we start mining with only 6 iso 7 cards.

I tried to look for any sollutions already but came without any..

Any help, ideas are highly appreciated.