Except the complaint above is somewhat legitimate since tuning in Linux is widely known not to be quite the same quality as windows and I don't think anyone in there right mind would argue that windows offers much better support for gaming at this time(although that's slowly changing).
Gaming... ?
I was strictly speaking about mining issues. What is difficult to tune?
There are two major limitations (for 7XXX): You cannot alter the voltage or set memory clock more than 150 Mhz lower compared with the GPU clock. (both issues can be fixed with a BIOS flash, although the 7xxx bios editing is not quite straightforward)
Other than that you can tune pretty much everything else I can think of.
Back to Windows, so I read about Windows 8 being able to work with 5 7XXX cards using 13.1.
Can you try that?
If you can't make the connection between gaming and mining (both graphic card related?) considering they use AMD drivers then there is no helping you and I'm a bigger fool for bothering with this post.
And yes altering the voltage is critical for me and I'm sure 99% of everyone here since my cards would overheat in minutes without voltage control as I found out quickly when I first built the system. No clue what cards you have but my first 4 were boost models and had major problems in the slots and adding risers helped a little but there is still issues with heat unless you have blower style fans (I have one like this).
