I am gonna take a stab at this one, but someone may correct me if I am wrong.
As far as small Retics are concerned, my understanding is that Super Dwarf females can max in size at about 6 feet, maybe 7, but that's it. They can weigh less than a big female Ball Python and still lay eggs. The eggs and hatchlings are in most cases also supposed to be smaller than, or similar in size to Ball Pythons eggs and hatchlings.
As far as locales are concerned, I am thinking that Kayuadi (spelling) Retics are probably the same or nearly the same as the Super Dwarfs. Selayers are also supposed to be small, and supposedly genetic stripes tend to stay small, as well as golden childs. You already mentioned Jamps.
Honestly, dwarfs do not interest me as much as they should. I just don't see the big deal. The only true beneficial aspect of them to me is that someone can still own a Retic if they live in an area where size limitations restrict snake ownership to smaller individual snakes.
If someone else can shed some light on this subject, I would be very interested in learning more about this as well.
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Rob Clark