Nice rednoW! Glad you got it working.
I made this little cheat sheet to help me tweaking the .reg file, going to publish below to possibly help other people. Below are the settings I'm using to achieve 1990 H/s @ 0.875. Custom values are highlighted in square brackets.
What are xmr-stak-amd's dev-branch improvements over the current released one, do you know?
No need to mod powerplay such hard, it can cause some glitches ))
As for dev-branch they have several commits since master branch, you can track it on github ... but no speed increase ))
I actually don't know from what sources they made windows binary they released.