It's not likely that one of the high pressure
fuel lines got clogged.
Fuel goes through one or two filters before getting there, a very sensitive
pump and the pressure is really, really high. Lower
fuel flow on that one
line could indicate there is still air in the system working its way out. Is that particular
line kinked/damaged?
I had an universal XP-25 on a previous boat and I don't remember having to crack injector
lines to bleed the system. Matter of fact, there were some who advocated leaving one of the bleeder knobs openned all the time, so it was a self bleeding system.