Were the new tires balanced? It's entirely possible you got an out of round tire. I put a pair of Sport Demons on my Moto Guzzi a year or two ago, and the front was out of round enough to feel in turns. It was minor, and I left it alone and wore it out. If it bothers you, I guess the dealer that sold it to you should be willing to let you return it and send you a new one.
It's unacceptable to me that a manufacturer lets out of round tires got sold, and I plan to avoid Pirelli tires in the future.
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