The jittering I normally get looks exactly like the video posted by @TonyZ in the first post. It looks more like the touchscreen isn’t calibrated. The whole screen bounces up and down uniformly. There normally isn’t any artifacting, however I have seen that sometimes when the plug isn’t in all the way, or sometimes the cable needs to be wiggled.
Yes, that was the typo. I assumed it was a typo, and connected the cable the correct way. Plus, I checked continuity on the original green cable and the adapter and confirmed both were wired the same way.