Novice modder here. Wanted to make gunpowder civs especially Turks and Ports a bit more appealing. I buffed HCs a bit, made artillery into essentially warwolf for bombard cannons. Wanted to make the organ guns more similar to scorpions. Instead of damaging units in a straight line, it damages groups in an area horizontally. I increased the number of projectiles it fires and the spread, but I can’t find the parameters to boost the secondary projectiles damage.
I think you are in the wrong section of the forum, here is the modding for aoe3, but it seem to me that you are talking about aoe2.
As far as i know , the only thing you can do is modifying unit attack times in art xml file. But those damages is equal.