I don't have those problems either but I'm also using the Dunlops.
As for larger wheels/tires, I experienced a very noticeable difference in mileage just from changing the pressure in my tires so I'd hate to see the difference larger wheels (more weight and rotational mass) and tires (more weight, rotational mass and road contact) would make. Of course, what I consider very noticeable may differ from what you consider noticeable.
Also, it might be a good idea to upgrade your brakes to account for the heavier wheels and tires. And you'll probably have to get your odometer recalibrated (my dealership said they can't do that but others might).
Just some things to consider.
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