About the zombie skills. Grabing, vomiting at you, keeping a safe distance are all animal level of intelligence which is fine, zombies should be dumb. I can even accept CBM usage as some kind of automatic response of the implants. I think martial art usage is fine, they practice that enough to be an automatic response.
But grenadiers are different level, they using homing explosive devices, it can’t be an automatic response or if it is because the just wear an automatic launcher, then they should not be an ex-human, but a robot, the military equipment usage already their territory.
So while i like the grenadier/burner/scientist zombies they are too intelligent because they use items. If they are intelligent enough to use items then soldiers should use their guns too.
I think it would be better if they would be just dumb, so no zombie grenadier/burner but stationary turrets or security bot equivalents.
Maybe scientist zombies should be similar to the amigara monsters or to the rat kings, they could freeze or mutate the player toon through their blob collective which already infected the player toon anyway.