How can I safely and painlessly downgrade catalyst drivers?

The latest version of catalyst is 11.8 and is horrible for me. For example, the computer screen does not turn on after going to sleep (a problem I had with 11.4 as well), when running applications from Terminal I'm constantly getting X errors, and now the latest is that I can't make boxee compile at all, complaining about missing lGL (I've googled around and people suggest reinstalling catalyst or installing mesa).
Disclaimer: I need catalyst drivers and not FOSS ones because of my hardware.
So the question is how would I go about downgrading from 11.8 to 11.7 as painlessly as possible?

Yes and I know how to generally downgrade packages, but catalyst is specific in that it's from AUR, it has many scripts attached to it, there is a kernel module, and my past experiences with trying to downgrade it resulted in a screwed up system (following the wiki)

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How can I safely and painlessly downgrade catalyst drivers?

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