I have an Atlas 1056B01 which is also called a OCAP-5. Yours is also called a OCAP-4, since it is a 4 device remote. Following steps 1-7 in your last post did allow me to successfully place EFC 00174 on the Video Source button. I then checked with a JP1 remote, and pressing Video Source in cable mode did send EFC 00174. And it continued to do so.
May I ask that you use a little more precision in your posts? For example, you wrote
However, when I change back to TV, or shut it off, it goes back to doing nothing.
Shut what off? The TV? What does doing nothing mean? Tapping Video Source while in Cable mode?
Of course you know what you mean. But we're not there, and we are left guessing.