Not uncommon at all for it to come back to a lesser degree. I also massage the water in a little. In other words after I mist it I rub my fingers over it a few times. It speads it out and penetrates better. Keep in mind also your twist is not just in the sheeting. it is also in the spars and LE & TE. So when you are done the sheeting is having to hold the spars straight. I would not be suprised after you flew it a few times that some of the twist mwill show up again. This is where using the covering will come in handy.
David