The only thing that is discussed is how far back the effects of balefire go. There's no definitive discussion on ANYthing else.

Notice something about Sanderson's comments. He said, 'let's say that the CK makes Rand 100x more powerful'. He's not saying it DOES - that's just his supposition. That's beautiful Aes Sedai misdirection.

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Extending that thought further then...

Why can't the CK make Rand more like 10,000x more powerful? That's always the order of magnitude I was imagining based on the descriptions in the book... for the strongest sa'angreal ever made? When an 'average' sa'angreal raises the user's ability above that of an angreal to the same order of magnitude that an 'average' angreal does over using no enhancement?

With that in mind, the existence of multiple sa'angreal multiplying your power 250x becomes extremely likely. 100x is certainly nothing special for a sa'angreal... and when you consider that these CK were considered 'too strong to ever be used', able to fight the Dark One (or the CREATOR, by Lanfear!), and able to crack the world in half... 100x Rand's power just doesn't fit the description.

10,000 times 30 minutes of Rand back-tracking is approximately 200 days. This isn't a proof that this happened, of course, but a proof of concept. If we can reach back in the vicinity of a year, then anything is still possible. And nothing Sanderson said ruled it out... all he addressed was a very limited 'what if'.