What would one do in the case where the inlet cam can be adjusted some 45degs to then test best injection timing and cam timing?
Different cam timing results in a different injection timing for light load cruising for best economy, question is which to adjust first and which gives the best results?
I would adjust EOI timing agter finding the ideal cam timing. The cam timing is going to have a more significant effect on performance, the EOI timing will allow you to run a leaner mixture with smoother running and better drivability. This is especially true with the Subaru engine.
Also is the base injection timing map for a ej207 in the start file a tested map or is a copy of oem maps?
I am not sure of the origins of the values in the start file but I would treat them as start up values only. As with any aspect of tuning the more time you spend on tuning the better the end result will be.
Another thing you might notice is when injecting on an open valve and timing is set to EOI, you need very little coolant temp correction once running.
The only reason we need enrichment as a function of engine temperature is to compensate for the fuel that is condensed on to the side of the inlet manifold/port/cylinder walls which will not burn and ultimately ends up in the oil. If the fuel is targeted and atomised well a greater portion of it is burnt so less compensation is needed.