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If you want to prevent overheating you need to be stingy with water. When soap heats up the water in the soap expands. As the soap cools down again it contracts. The more water in the soap the more expansion when the soap gets hot. I've tested ovenprocessing soaps from the same batch but with...

Looks to me like you've got an interesting combination of things going on there. Glycerine rivers typically don't happen gradually after the soap is past gel phase so the 'growing of spots' in room temp must be oxidation - perhaps of vanilla content in the fragrance oil. From the cut pic it...