hmm if I saw a cop I would have slowed down to either 65 or 70, not continue going 75 and switch lanes as this would only give him more reason to notice you. What could have happened was that you got nervous and stepped on the gas without even noticing it (thus he paced you for going 80). I know it's shitty but I that happened to me once. I got pulled over on 680 for going 80 and I was 2 miles from home.
But like others have said, he was probably just pacing you instead of using Lidar. Besides, I thought they're still just testing out the Lidar?? It's not officially been accepted yet and as of now, very few cops have them.