IDK if this has been said before, but I don't want to read that much and I feel like I must say it. The upped one shouldn't cost one

less AND last one more turn. I know that 4 turns can be worse than 3 turns in some cases, but I will suppose that you (the player) know what you're doing when you use this, and how to, thus being 4 turns better than 3.
That way, I think it should be either 6

/6

and 3/4 turns, or 6

/5

and 3/3 turns.