It does seem like a rather odd notion, as I've never heard of any instances where the Vulcan has ever been regarded as anything other than over-powered. Perhaps the Ascension comment comes from too many people reading that "607" paperback which does rather over-hype everything. Although I haven't read every line in that book (is it me, or is it too turgid?), I would think that somewhere in the text the author will have suggested that the Vulcan literally scraped off Ascension's runway with inches to spare... or something like that!
As for RATOG, I guess we have to assume that it was never more than a plan which resulted in switchery in the B1 cockpit, but never progressed beyond that.