RE: Charged vs. Greased vs. Dragon Ash
I'd like to point out that taking into account what kinds of damage a weapon is dealing is extremely important. Raw damage output is not that meaningful. Once damage has been modified against a particular component before time to kill or shots required to kill that component do calculations become meaningful. A weapon may have an extremely high raw damage output but deal negligible actual damage to a certain component.
Currently, Charged is still quite threatening and still has high effectiveness against hull and armor for some weapons. However, for Charged you must deal with its clip size and RoF reduction.
Charged is still a safe ammo to bring. Ultimately, it may not be that interesting and may end up getting cut if it doesn't get more niche. A further reduction to RoF, while good on paper, makes weapons painful to use.