Made a test today with 2 almost identical 6 x RX470 8GB rigs, same settings, same pool, same Phoenix eth miner: (used watt meter and pool data)
SMOS rig gives 2 % better hashrate, but consumes 9 % more energy then win 10 rig.
Bad surprise...
Linux drivers are little different than windows.
The same settings will not give the same results.
You can probably go lower in uv in smos or lower core.
There is many factors.
Also depend which os image you are using. Try the one with 18.30 amd libraries if you tried on 20.30 amd library image. (So try second link on website download page instead of first)