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The tire/wheel package you've moved to presents a lot different profile to the road. A narrow 65-series tire is much more rounded at the edges and acts that much narrower as the effective contact patch is a lower percentage of its (lesser) total width than your new size. And new tires tend to feel light in the steering for this reason--they still have some profiling left to them at the edges of the tire.
Tire makers profile tires carefully to optimize their steeing feel and noise characteristics. As you wear a tire flat, you lose the benefit of this and the steering feels heavier and noise increases. When a tire maker lays some marketing buzzword on you like 'uni-Q technology' or some crap like that they are often just referring to whatever profiling techniques they employ at the moment--as if other makers don't...
This is usually pretty obvious when you replace a set of tires with a new set of the same design. It's amazing how much more civilized the new set feels. Unfortunately, this sensation is gone all too soon as the road wears the tire ever-flatter across the width of the contact patch (amongst other changes).
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