Soaping cooler and less water slow trace. There is no jury still out on those two. But your oil mixture has to be one that can tolerate soaping cooler. I masterbatch my oils and lye/water. This allows me to soap almost at room temperature. I do occasionally get a seize if I am dealing with a new FO. But that is about the only time. And I keep good records of the FO's that misbehave. If I have some left, it gets to go in liquid soap.