3 injectors were unsatisfactory. I saw them on the test bench, one was borderline. The other two were way out. He swapped them for some spares he had and refreshed em. The fresh set were all identical and good spray pattern.

Apparently they always ran a bit lean from new, but this was amplified by the bad running I had, I suppose if richening a touch smooths everything out and makes it drive well then it should hav been like that from new.

Just don't wanna wear bores out or anything prematurely.