I don't think that the ECU monitors or records fuel injector pressure. The only indication of low fuel injector pressure is that the injectors max out to the limit in an attempt to maintain the correct mixture in closed loop operation. You will get a "check engine" light and a fault code listed on ProTune 2 when this happens. There is a Schrader valve test point on the RH (rear) injector to test the fuel pressure, it should be 58psi, that is the only indication. If you have not replaced the original fuel pump with a Walbro item, do so. The original pump will fail if it has not started to already, it's not a big or costly job and will save you a lot of time chasing problems.

I suggest you route your new ignition leads under the chassis tube they are presently P clipped to. They tend to rub on the top cowl edge, as yours appear to have done near the P clips. Some extra spiral insulation helps where things get close.

Thanks for the info about the fixed plug caps, new to me.