20ft sounds a bit far, but glitches happen.
Well, there's the splat of the grenade hitting the ground and spewing paint, and then there's little sounds when the paint rains down. In reality, paint grenades don't make much sound at all.
what good is increasing the range on the sound? why would you need to hear a nade exploding on the other side of the map. don't be near the grenade when it explodes.