It's not about what you read it's about hand on experience and and finding what works for YOU and your animals. I definitely do not recommend dropping temperture below 75 unhealthy tempertures plus the stress of breeding is not a good combination, when people talk bout dropping temps they usually talk about dropping temps on the warm side.
Remember that you wan your snake to keep eating during breeding season and if you drop your temp below unhealthy range you will end up with animals that will regurgitate their food.
Light cycle and barometric pressure are more important IMO as well as being able to read your animals.