Is there any chance the community could see this “reference client”? Is there an assumption made that there are no bugs on the reference client?
There are retail vanilla PvP videos of people with low ping that show a shorter leeway range than what we see in classic wow.
Have you reconciled classic wow with your own patch notes regarding trap/scatter DR? Your patch note says that freezing trap now shares DR with "similar effects’. Scatter shot is not a “similar effect”