Downgrade using Snow Leopard install DVD does not work on iMac 27"

I have an iMac 27" (SMC version 1.54f36) that I wish to downgrade. I bought a 5-user Snow Leopard license. Now I'm trying to re-install from the DVD, but the computer won't boot on the DVD.
If I run the installer from the desktop, the installation starts, but when the computer reboots, it gets stuck. No alterations is done on the system disk, so I can hold down the Alt key and choose to boot from the system disk and I'm still on 10.6.5. For the moment I cannot find the discs supplied with the iMac, but surely the SL install DVD should work?? I've used it once before to do a clean SL install (I believe the iMac I have came with Leopard).
The version on the SL install DVD is 10.6 (2Z691-6558-A)
The reason for downgrading is that my Pro Apps (DVDSP and FCP) got a bit shaky when I updated to 10.6.5.

If you have a 27" iMac, it had to ship with Snow Leopard installed. See Mac OS X versions (builds) included with Intel-based Macs to confirm this, & Don't install a version of Mac OS X earlier than what came with your Mac for why you should not try to downgrade to an earlier version.
If the version on your SL install DVD is 10.6, then it is an early version & will not work with your iMac. The current retail product version installs 10.6.4 & should work if your iMac is the "Late 2009" model. It probably will not work if your iMac is the "Mid 2010" model.
You need your grey system discs. They should be kept accessible wherever you use your iMac. If you have lost them, contact Apple about getting a replacement set.

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