Menial tasks on a time frame lead to bad habits. You just have to breath, plan more than 1 step ahead every once in a while and do tasks early rather than all at the same time.
For the preload that means scanning, writing hins and even sending in scans can be done before you even pick the package off the belt. Then all you need to worry about is placing street A next to another box for street A.
The PAS numbered sorting system naturally does not accomplish good load density, it works great for 200-piece loads, it sucks for 400-piece loads. Just an observation.