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Injector control pressure is a good diag tool. Lets you know how the HPOP is doing and The IPR is doing it's job. The higher the pressure the better the injectors open!
ICP is a measure of the high pressure oil system, and is a good tool for keeping an eye on the health of your HPO side of things.
Most folks use ICP pressure, some volts, but it's personal preference.
For instance, if you were telling the forum you are only making 3000 psi at WOT, it would indicate you likely have a leak somewhere since it's capable of closer to and even over 4000 psi at WOT.
Assuming you are running a 6.0?