So tell me, what 'scale' represents that of the brain? It seems that for some reason you have ruled out the very idea that quantum processes can influence macro behaviour. This is demonstrably false, and it seems likely that if there is a conscious field then it would interface with the brain at the quantum scale. Indeed, what other option could there be?
To give Carroll a bit of credit he's talking about evidential effects. Consciousness does not fall into this bracket. Either you believe it does not exist, in which case there's nothing to talk about, or you do accept it exists and further accept that at this moment there is not a shred of evidence to support that conclusion. Therefore, it could be considered not part of the 'everyday' universe.
It's not. To take your analogy, I maintain that you can rig up a device to smack one of those pool balls off the table and through the window solely on the trigger of a single, random sub-atomic event. You deny this is possible and say that Newton's laws are always sufficient to describe the balls' motions, and when I explain how I'm right you say, "Oh, sure, but I'm talking about everyday stuff!"