I found that the dos spots has to do with improper mixing, high percentage of superfat, and not mixing it well.
I have read several articles that do not recommend adding excess lye to prevent this, instead do a lye discount. I use to get them but I noticed I don't now ever. I mix well. I mix the oils before adding the lye and if using any additives make sure they are powdered and not chunks. Combine the oils and lye and mix well.
When drying --- if there is high humidity for prolonged time there is more DOS. Dry soaps in a dry room with a dehumidifier. Dry wall vs concrete concrete - concrete holds moisture or just store the the soap boxes in boxes not plastic. When it rains put the dehumidifier and ac on.