Just to follow up, I have since purchased an official SNK RGB cable. Now I'm just getting a red, rolling picture on the sony as opposed to the yellowed tinged, but fully visible issue with the others. Same on a samsung. Tested with two different AES systems and same result. Higher number serial systems, not that it should matter, but I would assume there would be less chance of a cap leaking causing this issue, especially on two different systems with the same exact color issues.
So, I have tried:
Official SNK cables
PC engine RGB
HD retrovision cable with neo geo adapter
Have had some kind of issue with all. The system works fine with composite cables. Frustrating, because I am now using RGB where possible on the systems that I have, and this is the only one that is giving me a hard time.