From what I've seen online, it seems that many people have crossed SDs to create smaller morph retics.

Unfortunatly this leads to "mutting" with sd/dwarf/mainland crosses, and this becomes a huge problem with the morph siblings..

I have seen plenty of snakes labeled as "super dwarves" that don't look like super dwarves. They don't have the darker coloring and smaller head and slight difference in pattern, in fact they very much like they have some mainland influence in them.

It is just something to note, if you want a super dwarf get it from a breeder who is working with pure SDs.

If you want something a little bigger than a SD, mutt crosses shouldn't be hard to find! Find any breeder making "super dwarf" morphs, and ask about normal siblings.

Hope that helps