Also, I've been playing since 2014 and just got a porcelain! Then 2 more!!! Husband plays on iOS and gets alot of winter rose fails. I use Android and still waiting for my first.
It seems like S8 random breeding is not so random and whatever algorithm they use to pick dragons for us to get is beyond terrible. When you visit other islands just look at the nests and see how often the same, not common, dragons are there. If I see an egg showing 2,3 times and my den is working on the same colors and hours it's a good bet that's what i get too.