tracers were not affected, just the radius of the bullets, they would not do any more damage then they usually do.
It was just easier or harder to hit, depending on the radius, no difference in lethality.
There was a different dot command for bullet lethality, I can't remember what it was.
You could log into an arena in WB and do a ".show" command, and a window would pop up showing you all the values of the arena, including bullet radius & lethality.