Darn Kitty Stricks again….

Good morning y’all, just picked up Cat ET and had truck tuned. I was informed it was a 650hp tune. Upon investigation of the ET I came across the hp and other specs and wouldn’t you know no info. I did in fact have truck off key on so why in the world are my specs not showing up. No codes are present on the truck and it runs fair I guess, have a lag in it from time to time. Running into Colorado truck ran good and #### if I didn’t get other Pete guys asking where my smoke was at. Truck is 05 379 single conversion MXS 77176.
Fass pump, bigger supply and return lines, fuel supply to rear of head, fs1212/1202 Fass filters, and factory cat secondary. I’m starting to point to Fass, I don’t have snubber but I have fuel gauge, 100/115 pressure but it jumps so bad I can’t catch if it’s low pressure or something else. Another question, the Fass pump install I had to remove spring in transfer pump and adjust pressure reg in filter housing. Question is how much pressure should it deliver to t/pump? Thank y’all I’m about to make trip from Co to Tennessee just wanted opinions thoughts. ‘thanks yall