I tried the shrink bags for the first time this weekend. I guess I'm not making a large enough puncture in the bag because I'm left with air pockets. I'm piercing over the breast. Not over the breast bone as I now read that I'm supposed to , but just to the side of the breast bone. I used a wooden toothpick to pierce the bag, dunked, and waited for the air to escape before removing the chicken from the water. Still have air in bag. What do you use to pierce the bag? When you dunk the bag, do you hold it with the puncture facing up? or does it matter.