My lo used to grunt ALOT, and it took me a while but it was gas related, not her trying to escape the swaddle. She still does grunt a bit now when i feed her in the night, but i know its gas related as she won't wind when she falls back to sleep, so i get fed up and just put her down. She is normally so tired she just goes back to sleep.
I am still loving the miracle blanket, even though i have just put my very OT lo down without it, as it took me an hour to get her to sleep, and hadn't swaddled her so i wasn't waking her to swaddle her. Wonder how long it'll last as she had some pretty major jolts before i pinned her down with the sheet!
BTW, when my LO wouldn't settle because of gas, i used to just pick her up and wind her over my shoulder. Sometimes she wouldn't bring anything up, but i think the motion just relieved the discomfort a bit and she went back to sleep. If she doesn't bring anything up after 5 mins of winding, put her back down for 10 mins, and if she is still uncomfortable, pick her up and try again. Thats what i do anyway.
HTH