Hi,
A consistent issue with the defensive line is that the opposite side of the attack (example: the attack incoming from the right side, the further left defender is the problem). The issue being as we are running back, they don't stay with the line but aggresively push back and back basically keeping anyone else onside.
It's impossible to manually control the defender being attached (right side) and also control the defender on the opposite side of the pitch.
They should not track back without a brain. Instead, they should stick closely or as close as possible to the defensive line and if I want to grab them and track a run, that should be the manual movement.
Hope I explained it correctly. I think it is one of the most annoying defensive issues.