I'm not really clear on the "SDRuno" app's "IARU Region 1 S-Meter Standard" Wikipedia.
When "SDRuno" app's "IARU Region 1 S-Meter Standard" is checked - It definitely does not match up with my R2 Yaesu FTDX-5000's S-Meter on 6 meters (50 Mhz) - it's WAY to high in SDRuno when this is checked (compared to my FTDX-5000).
The setting is here:
In the "Main" window > "Sett." > "
Using these settings the two rigs match up very closely in my usage.