Hello Candlemakers: I am a newbie to making candles and desperately need your help!! I am trying to pour Cargill C-3 Soy Wax into a glass tumbler 2.5" diameter, 3" tall. I am able to get a good pour with minor sinking near the wick - so far so good! My problem - after about 2 or 3 days the wax starts to come away from the glass tumbler. They are stored in a climate control area of 68% so its not a temp issue. I even had one last night that had great adhesion, but after burning for about an hour it pulled away about 80% from the glass. Any tips, ideas, suggestions??