Welcome! Keep in mind a lift will hurt your MPG, I know most people don't like the idea of losing MPG when the #1 selling point of the EcoDiesel is fuel mileage in a full size truck.
Welcome!
Driving the distance you drive should take care of the Regen process no doubt. If you had some type of OBD 2 monitor you could actually see the DPF full percentage and see how the truck is acting.. But, I'd let the dealer figure it out since the fuel mileage has dropped. Should be a...