You aren't running out of injector for sure. The issue is that HPT displays the IPW based on old tables and the 04+ will go all the way to 34ms IPW without issue. This is a returnless system so the fuel pressure is fixed. Look into the tune file and check out your IFR table and make sure it's still stock. Also check the MAF table and see what is setup there. The timing vs time vs RPM or I can't remember what it is called is usually dropped a lot up to 15 seconds then they leave it stock. The voltage drop is likely due to the alternator cutout RPM. If your sparkplug wires are close to the signal from the fuel pressure sensor then it may be affecting the reading. I had an issue where my fuel pressure gauge would go dead when I got on the gas. I would have to shut the car off open the door to kill RAP and then restart the car to get it working again. I moved the wiring and it went away.
That's a start
Jeff
