I have a black pastel pied that I had originally planned to produce a Panda with, but now that she's actually breeding size I've decided to move towards other black pastel pied combos...namely black pastel pixel pied, and eventually black pastel albino pied.
Back 5 years ago when I bought her I was more of the understanding that only super cinny had the deformities and that super black pastel was a 'safer' route. However time has shown that this isn't the case. So I dropped my Panda project in favor of healthier hatchlings.