Since this my first post, HI! I have a problem. I am making loaf candles, which are 3x3x6 and 3x3x10 inch square pillars turned on their sides. My problem is that after the second or third burn they are cracking in half, I mean all the way through. I am using EcoSoy Pillar wax with 2.0 wicks. About 1.5 - 2 oz of scent per pound Any suggestions would be a great help.