Ford FG G6 vibrates through gears

Not long after I bought my 2010 FG G6 Limited Edition I began to notice a slight vibration through the car when it changed softly from fourth to fifth gear. When the change is quick there is nothing noticeable. It is most prominent on hills in cruise control, when the car drops back a gear, gets up to the required speed, then drops out of fourth, vibrates for around a second, and then changes into fifth. Another is when you get to your required speed, usually over 80 km/h, and the car changes gear to cruise in fifth, same deal, it goes out of fourth, vibrates then clicks into fifth. When I took my car to the dealer I got a couple of responses. Firstly, I was told it was the way I was driving my car, and the adaptive gearbox hadn't 'adapted properly', and that a computer reset had fixed my problem. It hadn't. I let this dealership know nothing had changed and they said they would call Ford and get back to me. When I was called back, the dealership told me Ford said "It is probably a trait of the gearbox, and until it happens in another gear change, nothing needs to be done." I decided to try my luck at a different dealership. Their response was that it was a slight vibration, but nothing abnormal. I'm yet to understand how they call an abnormal vibration not abnormal. Have you heard of anything problematic with the five-speed gearbox? I am wondering what my plan of attack should be with this situation. I feel like as now they have my money for my brand new car, their job is complete and they couldn't really care less.