I tried it that way too, and after 3 months, I started using a different method on the other side of the island, that actually worked. It's explained in this video.
But, even with the video it's super hard to keep track of all the steps, so I ended up making a decision tree diagram that walks through the whole process step by step. It's not pretty, like a lot of the others, but it is easy to read!
https://cloudup.com/c3u9A3IVUk4
Let me know if you want a jump start! I've got plenty of super whites left over.