Hi I'm using cb advanced soy in square containers. Have poured at 140, 130, 125, 114 and 105 (slushy) and I keep getting sink holes. The one at 105 wasn't too bad but suffered with bubbles and horrid release from the glass. I'm trying to stick to one pour and avoid any heat gunning but after reading a few threads that's looking less likely. Are square containers more prone to sink that round ones and are there any techniques that give me flatter tops? Thanks Jon