Is anyone currently using the vertical 25# mold? I have now made 5 batches in this mold and cannot get full gel. The center gets so hot it heaves up and cracks the top but the gel never reaches into the corners. After 18 years of soap making, I am truly frustrated. As recommended by the company, I do not insulate (that obviously would make the volcano even greater). I love the design of the mold and the cutter but I need full gel. Any feedback would be appreciated.