Blocked injector is an option but that would most likely throw up misfire codes as well unless its all injectors slightly blocked on that side and not just one. When you swap sides you will see if its that or something else. Try also swapping lambdas.
There is quite a difference between both sides which could mean there is breathing problem one bank getting more than it's fair share of air if is the same after swapping injectors and lambdas.
You can also test lambdas on a bench while off the car with blowtorch and voltmeter.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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