The only reason I knew it was in safety boost was because my low octane maps run safer - i.e. less advanced timing and more fuel delivery. This inherently produces less power, which is what I noticed and keyed me off to the fact that something isn't right.
I've never experienced this before, although when I setup the program I knew this would happen. Its just very reassuring to see when something you did that you forgot about comes around to help you out later on. :)