I'm in north orange county. I go on the 22 fwy and 405 fwy a lot and a lot in the city too. It's like 60% fwy and 40% city. What setting should I use on my pro 78 se? Also, I always get k band reading from level 3 to 8 while on the 22 fwy that last for like a mile or two. I think that's false alert there. Is it?