I used to get pulled all the time when I was younger (Ridiculously often at average 5 times a week), I went to local cop shop and filed a harrassment case against them, I never got pulled again for 15 years!
I would not mind, young chap driving nice car, but was always full legit, every time they pulled me they gave me a "Producer" to "Record" my documents, it was this little box being ticked that ensured my harrassment case was held up as It was easy to see they held my details but pulled me anyway, I mentioned how their records system must be pretty crap as they had to record them every day or 2!!.
Regards your car, it could be a marker from a previous owner who maybe did not have insurance at some point or had a marker for drugs etc, yu can go to police station and ask them to remove any markers as you are the new owner and dont want any hassle or like being followed!
Been followed once in last 15 years by police, i let it go for half a mile but when I made 2 turns and he matched me I pulled over in next layby, got out and lit a Ciggie, he pulled in behind me and asked why I had stopped?, I just laughed and held up my Ciggie
he took a quick glance at my tyres and off he went!, that was 3 years back and not been stopped since