text: I only use silicone moulds. I always heat them to get them shining before use. I do place them on a silicone sheet so they don’t sit directly on the cold worktop but don’t heat before pouring.
  I start pouring at 55c and I don’t get frosting. Hopefully when you lower the pour temp it will help.
  There’s an article on the CS website somewhere showing 3 melts poured at 55/50/45 (I think) 55 is the shiniest so I think that is the ideal.