No I haven't.
After 4 years and probably 40-60 rolls gone through, as well as hearing the experience of others with this paper, I accepted that is it just part of the experience with this paper on rolls. As I said, it almost never shows up on cut sheet (of which I've gone through maybe 20-30 boxes of 50 sheets of 13x19"). With the print I described, roughly 1 in 4 or 5 is discarded/destroyed due to the scratches (people can be particularly picky when paying $950 for a print) and I've sold almost 50 of those now not including the two smaller sizes. Yes occasionally I will get a roll that is clean and clear of these scratches all the way through, but that's a rarity.
It's not now often that much of an issue as I've had plenty of experience with it, but now that I'm (as of August) using rolls wider than 17" and seeing the same thing, I'm interested to hear others experiences with similar paper like the Canson.