Well that's maybe why t takes practice to master a skill?, now there's nothing to practice using GX, just spam and noob around.
In any case this will be the new meta, the damage of grim should be nerfed more, it will be OP specially it's so easy to backslide away and spam 3-7x Grim before getting caught.
Now, GX can spam a high damaging skill without any Risk, that's the reason why katar type is supposedly 2 handed, High damage but High Risk. and GX is one if not the only class that requires much practice. 12% is not that much, since katar can now be the main weapon, it should be reduced more. The main problem here is the gameplay, not the damage.
To rephrase the sentence, again, Not "I" but "It" can be switched from offense to defense and that just takes a little practice, that's what separates GX from other classes.