OMG , thats some report, its clear that there are a only a few places that would go to these lengths to sort this out, JKM are
Clutching at straws from reading the doc, I considered a flow reduction somewhere between pump and injectors (if thats possible)
Pump etc can supply but on the other side injectors flat out trying to add more fuel (which isnt there), the spikes happen as the flow reduction happens (i.e. the pipe backs up) . Would need to be prior to injector feeds for it to effect all injectors.
Anyway what do I know ? lol just postulating.
JKM will sort it
its just the longest and toughest diagnostic issue this forums ever seen
chin up