LMM Fuel Rail Pressure

Got a new to me 2009 LMM. I wanted to check the health of things so I logged the 8 injector balance rates, along with fuel rail pressure actual versus desired. Problem I'm having is the Fuel rail actual pressure is constantly reading around 18,500psi all the time. At idle or WOT it is the same. Am I logging the wrong pid?

The other question is I logged the TP%, however it is always at 50%. why? am I logging the wrong PID? what should I be watching to know how much throttle is being given?

Attached is my tune and log file.

BTW, is this the correct stock tune file for a 2009 LMM Duramax?

bump this up to get some help.

These are the two you need to log for TPS% and actual rail pressure
APP
FRP_C

Go here https://tis2web.service.gm.com/tis2web
put your vin in and check the ecm for the correct cal id"s to see if you have the correct file.