Never seen a super form or bred a stripe x stripe. My buddy hasn't either. Next year the females will be big enough to bred so we will find out next year.
I know more because I bought some from VMS and bred the males last year to a lot of females. I tried to sell the offspring and no one was interested at all. After bringing them to several shows and getting no where with them I sold the remaining snakes to a friend as he wanted a cheap project to work on. He did some more work and now I have more information. Honestly I had no idea anyone even cared about the wides at all.
I know about the different lines from talking to folks at shows and talking to guys from Canada and Italy. I have family in both areas and they know i'm into reptiles and with the internet we got to emailing and exchanging info.
No idea on trying to bred the different lines I haven't heard of this happening. Doesn't mean it hasn't happened.
I think the reason it's no more "known" is very simply put they aren't too special. There are lots of normals out there that have a very similar appearance. In the grand scheme of morphs out there they aren't that different from a normal. Some of the combos are nice but again if you can't sell them at a decent price you end up with lots of pretty pets. Lets say you bred a wide to a mojave you get 5 eggs and 1 is a normal wide and 1 is a stripe mojave. You now have to market the stripe mojave and show it's genetic. Easier said then done. It just may not be worth the time and effort. Remember not everyone thinks they are all that special.