OK Mod, you asked. Don't blame me if it creates more work for you.
Eliminate the document checker and redeploy to screening.
Use one way exit doors from airside, eliminate those positions and redeploy to screening.
Screen everything that goes into the baggage compartment.
Screen every passenger in the same manner used of PreCheck.
Modify, increase, the liquid limits.
Take a lot of items, particularly sports equipment and tools, off the prohibited from carry on list. Realize that all kinds of permitted common everyday items can become dangerous weapons in the hands of a person with bad intent. Pens, pencils, keys, belts, shoelaces, lanyards, newspapers and even the lap blanket.
Sniffer dogs are fine, just realize they are limited in the time they can work. Armed patrols on the other hand - nope, don't need them. Airports have adequate police presence already. In reality, both are mostly theater.
I don't have a fix for the biggest problem. The amount of dangerous items missed at the checkpoint. "Red Teams" manage to get all kinds of bad stuff through the checkpoint with a high success rate. It's only reasonable to conclude that the "bad guys" have similar success. Some security experts think it is, at least partially, because screeners are focused innocuous items that are on the "banned list."