rich

Injector timing will only have a noticable effect at short duty cycles - say <25%.  Once load increases and the injector is open for longer than that then there is simply not enough time to inject all the fuel into the ideal window.  So you will gain some economy and often smoother running at low loads, but how much difference that makes to your overall fuel economy will depend what percentage of your time you spend running at low loads.
Typically just a 2D table with RPM as the axis is all you need.

Yes, there is a bug in the current firmware, it was just recently discovered.  It only effects subaru's that use the 33/66/100% DC FP control mode.  Basically Low speed and medium speed are swapped over.  The work-around for now is to put the same vaule in the FP low>med setting as the FP Med>high setting as per the example below.  This will give 66% fuel pump DC up to 20% inj DC, then switch straight to 100% Fuel pump.

Per the help file:
with bosch aftermarket sensor use 6khz

Would need to check the lambda average reading, The lambda target table will also need to be set up to suit.