In this cases it would not help, since you are manipulating the DT of your target. Also you have to set the DT of your target lower Before the shot and set it back to its old value after the shot. The problem is that you can't set it before the shot makes the damage.

The calculation is still complex.
Is it possible to get the current shot damage from the player or must i calculate it by hand?
Is there even a function to get the weapon damge from a equiped weapon?
I'm not sure if its possible to calculate all things you need for this, also it could be a problem when you have a big script and a fast firing weapon, maybe performance problems come in here.