I would take out the steal for 2 cloaks.
6 turns of protection is quite a lot, especially because the AI as of now doesn't actually target Cloaks with any PC ever.
That's an interesting idea for the next patch (when Cloak's duration goes up to 3 turns), since the bit of testing I did in trainer (custom deck AI is wonderfully wonderful) showed that the AI won't "waste" permanent control on Cloak and that it will probably start throwing mass-creature control when you have three unquinted creatures out.
It is possible to rush out Destroyers faster if you have a Cloak in hand, but you'd then be taking a gamble on being able to find a Quint and/or the quanta to play it in time.
I would still try to keep the deck at 35 cards, though. Any more than that, and it will necessitate the use of a third Hourglass.
Bottom line: If you choose to use Cloak in v1.27, go -1 PA, -1 Steal, +2 Cloak.