The take offs near the end will have better airflow
If the extended duct (same size) doesn't leak then the airflow will be better because as the air is removed, the velocity in the trunk is reduced and the air has an easier time making that 90 degree turn at the take off.
look at the take off fitting values close to the begining and after the 2nd, 3rd of more hits with no size change
You have got to learn from other people's mistakes! Because God knows you don't live long enough to make them all yourself !!!!!!!!