You have some stunning looking cinnies! Black back cinnies are the way to go, they are hard to find. I would have to say breed them to a yellow belly or ivory and definitely to your super lesser. Have you seen cinnamon lessers or YB cinnies? Both are way too cool for only being double gene animals. I don't know if you want to go a longer route but cinnamon hypos are another solid choice in my book.