Checking the box with a dominator/ hp/ avenger ECU effectively switches the ecu to staged injection if wired correctly. The primary(front) injectors will be on at all times. The rears will ramp in at the tps position selected in the software.
I found the factory setting on the avenger system to be pretty dang close to what it needed to be. I decreased the secondary value just a small amount to clean up a lean spot that you could see in logs, but not actually feel.
I have not dealt with a sniper system. Does it use an hp ecu or is it something else?

"use it 'till it breaks, replace as needed"