I have a similar setup running CM 7.1 on a Blade but I hadn't delved into some of the Screen Tweaks. Thanks for the tips.
I get _very_ occasional reboots when GPS switches on sometimes but other than that, very stable and a step up from the Swedish Spring ROM I was using previously.
There are means to move a first gen Blade upto a second gen so that later versions of CM7 are available. Fully reversible if anyone's worried about doing damage.