Cool downs are something we can play with, but damage will likely stay where it's at. Keep in mind the damage vs infantry wasn't changed in the last update, just it's performance vs vehicles and buildings. Although damage was halved, it's damage AOE modifiers were increased to compensate - allowing it to effective perform the same vs infantry as a result.
You only increased the far damage modifier, giving a couple of extra points of damage on "misses". Meanwhile you left the mid range damage modifier which actually matters the most untouched. Thus you actually gave the aoe a huge nerf.
ie. You increased the far value on damage from 0.05 to 0.1 and thus balanced out raw damage going from 160 to 80 at the edge of the aoe. But you left the mid damage multiplier at 0.35 even though it also needed to be doubled to 0.7 to maintain the aoe damage so effectively the damage values are heavily reduced at all aoe ranges between near (1.5) and far (4.5).