Same exact issues I'm seeing right now. Did everything possible to un-install, re-install using DDU, AND AND a Clean OS install on the bench. Still not getting 127% what so ever. Difference in benchmark scores is with-in 1% margin of error.
Running the ECHO Batch file shows the power limit set at 355W. GPU-Z shows power throttling at 117% AVG and peaking just above at 118-119% but never touching 127% or above. BIOS is the 1.90. It's as if the Slave BIOS isn't doing anything but unlocking a slider to 127% but does nothing for actual OC results.
Using Superposition 4K Optimized: Exploring further: Seems +0 Core, +612 Memory shows around 106-108% Power Limit, but still hits power limit in both GPU-Z and PX HWM panel a few times. If you run just a +78 Core, there's no power limit tripped. Hits around 110-111% max. If using both +78 Core and +612 Memory, it hits Power limit alot at 117% even though everything is showing 127% in the BIOS choosen.
So apparently 127% doesn't do anything. Results are quite similar once back on Master 117% BIOS.