I've experienced the same sort of cupping on the OEM tires on my Yager GT 200i, almost all the way over to the edge (tiny chicken strips on my tires, if I lean any further, I scrape). I started seeing it at around 6500 miles, on both front and rear. More pronounced on the front.
When I'm leaned way in on a high speed turn (a 35 MPH curve taken at 70 MPH, for instance), I can feel the bike kind of "squirming" a bit, like the tires are slipping then catching. Pushing the inner handlebar outward (ie: taking a left-hand curve, steer right a very slight amount) and leaning outward a bit to compensate seems to smooth it out. So it's perhaps a result of being a bit too aggressive in the curves.
Strangely, I only notice it doing this on curves that are sloped (ie: the roadway is sloped toward the inner radius of the curve). Not sure why.
