I would ditch the Edge/Att combo or just use them on the stock setting as gauges. I would get an SCT x3 programer with custom tunes. This will also read and clear codes. You can research SCT on here and you will see thats what is working best on the 6.0's.
A good stand alone reader is gonna run pretty close price wise to the SCT so why not have the best programer for the truck and the reader in one. IMO