The DWS is an all-season, whereas your Hankooks are summer performance tires. They're not really directly comparable because of that. That being said, the DWS is a great tire for an all-season.
I recommend sticking with a 235/265 stagger, although the 235/275 stagger are virtually the same height. I can't guarantee that you'll have no rubbing in the rear if you decide to run a 275.
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