If you have the engine apart still, try checking that you have even fuel flow to all the fuel injectors. You can do this by taking the fuel ring, running gas through it and then lighting the needles (it takes only a veyr small amount of gas). If you have an uneven flame from one or some of the needles or no flame, then that will be causing a hot spot, which may be aligned with your EGT probe.

The ECU will be holding the rpm due to high temperature. If the pump was a limiting factor, then the PW would continue to increase as the ECU tried to get more fuel flow.