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The wheel and tire package seems good from what I know, but if that is the only thing you have changed recently I would still be leery of some unknown effect going on. Maybe from tire patterns or rubber compounds, or maybe side wall stiffness.
Otherwise if you haven't already check your brakes for dragging, and wheels bearings (with heavy wheel/tire packages wheel bearings don't seem to last as long), tire rods, ball joints for any play. They are all pretty easy to check for if you have a jack. Did the old tires have any strange wear that would be an indicator also.
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