Welcome to the Planet! Looks like you know your synos, which is great!
Yours looks a bit like my Angie - my ID questions from back when I was starting with the synos:
http://www.planetcatfish.com/forum/view ... it=syno+ID
From paying close attention to innumerable syno ID questions here and a few other forums for several years (which has not, however, made me into any sort of expert), two things that are consistent are that
-- hybrids abound and keep growing in number and diversity and IMO have exceeded the offer of the genuine species, that is if one walks into any random LFS and blindly picks a syno, the chances nowadays became more than 50% it would be a hybrid (perhaps at least on the US east coast, which is what I know from experience);
-- ID-ing these is almost always fruitless - laymen like me are usually clueless; experts and syno-buffs like Richard B and Birger above, tend not to want to make wild unsupported guesses as to the parent lineage because there is really not a good need in that to care for them - that's their message it would appear to me. They will correct me/augment me if I am found wrong/wanting.
On a personal level, most of the syno aficionados, if not all, strongly dislike everything that came about with hybrid syno appearance. The reasons abound - from messing with mother nature to cruel, inhumane ways the synos are produced, to polluting the hobby, to easthetics, etc. etc. etc.
Racoll (one of the ichthyologist members here) has been doing some DNA studies on hybrid synos with one of the goals of reverse engineering, if I am not mistaken. I hope he will chime in. I have not seen a summary of his findings, perhaps in part because DNA analysis itself has its caveats and limitations in the result interpretation, or maybe I missed it, so someone will point it out, hopefully.
Threads like these may help you a bit further:
http://www.planetcatfish.com/forum/view ... =8&t=28659