I thought about possibly a timing issue but with such low hours didn't figure that would be it. But production lines are built with components which all have their tolerances and assembly testings are sometimes made with green/yellow/red, pass-fail areas on a test meter, maybe not pumps themselves, but other components that can affect timing. The assembly instructions say set the timing at 0 and that's for all the components built to support that assembly line with their tolerances coming down it. Surely makes sense.
Other thing is that this is the least potentially destructive thing I can change as opening up the fuel system and swapping out injectors on both tractors is just asking for trouble. I'll tweak it tomorrow and check back in.
Thanks for kicking in Al.......the pump guy. Grin.