Without seeing some of the readings live it's difficult , some of the duty cycles being off could be down to different readings from air mass meters , at this point I would blank off both egrs valves with plates then see if the readings come more inline .
If the air mass readings come more inline sort of proves that one of the egrs is bleeding over , if air mass readings where still off you could try swapping air mass meters from bank to bank to see if a low reading transfers .
Have you looked at the turbo wastegate controllers to see if they both do a good sweep.
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