Myself and my Thai fiance are in process of working on her K1 visa to the U.S. I have been offered a new job (better pay, on the West Coast, and better benefits). The support papers we did for her have information pertaining to my old job. Since I will be starting a new job, do I need to redo our support papers and list the new job and my new salary? Having to do that would set us back but I don't want screw up our chances. Is the embassy going to call up my old company that is listed (in support papers and letter stating how much I make, ect.)? What can I expect and what should I do?

Myself and my Thai fiance are in process of working on her K1 visa to the U.S. I have been offered a new job (better pay, on the West Coast, and better benefits). The support papers we did for her have information pertaining to my old job. Since I will be starting a new job, do I need to redo our support papers and list the new job and my new salary? Having to do that would set us back but I don't want screw up our chances. Is the embassy going to call up my old company that is listed (in support papers and letter stating how much I make, ect.)? What can I expect and what should I do?

You will find that it is a requirement to notify the embassy of any changes and your change is quite major. The risk of not notifying them IMO would be much greater, and as you have stated the new job is better, so may in part strengthen the support part of your case.