both still are weak choices and could use a bit ramping them up

Zombie Form,
remove attack speed penalty & remove increased dice and add movement speed penalty instead.
Because the Dice increase does in no way make up for the damage lost through attack speed penalty.
Movement penalty fits better because we all know the shambling hordes of undead are slow.

Vampire Form,
i would still remove the extra extra light damage but obviously you think its fun to get fizzed so ok, leave this as it is.
BUT when you get WAY higher damage you should get a way to live through it, so add lesser Vampirism to the Base form and add Vampirism to the improved Form.

thanks for your time