What to log?

x MadMAX DIESEL

<<<< No Horsepower
Dec 30, 2008
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Lexington, Ky
What should I log to track down a fuel problem? What should I add, or what don't I need? Heres what I have so far.

Main injection fuel flow rate
main injection pulse time
absolute throttle position
accelerator pedal position
actual boost pressure
actual rail pressure
desired rail pressure
desired fuel rail pressure regulator current
main injection timing
measured injection pump timing
throttle base fuel flow rate

I figured throttle may be good because the problem is low power past half throttle