I just removed a 404 from you IS, I hated it. Noisy, vibrated and cupped badly. I also have one on my standard, same thing. I replaced the IS tire with a bridgestone battleaxe, much better. I would stay away from the Dunlop. YMMV.
I'm surprised by your assessment. I've put tens of thousands of miles on several rear Dunlop D404's, on the front, reversed, without issue.