How old is your V1, some of the higher budget districts use different bands that older units cant pick up. and FYI 10 over is usually the ACCEPTED limit for troopers and local pd. 15 is too much.
This is coming from Monroe Country Sheriffs, State Troopers and locals round here. I know a lot of them. 10 is the standard, above that they start hunting you down.
Officers will jack it up becuase they can and are trying to TEACH YOU A LESSON! which is to slow down in WS. flow of traffic or not, they want you to stop. Your Cop magnet of a car doesnt help either.