Ok I think I might be done here. My girlfriend was here and she kept insisting it's not going green, it's going "turquoise". So with chroma turned off, it still shifted again. With her saying I'm wrong and it's not going green but turquoise I think to myself that would maybe mean RED is actually going down rather than green going up.
She was right. As soon as I touched the red drive control it flickered like mad. So I shot it with some deoxit and now it looks like I might be obtaining a stable picture now. Still not sure how a power surge caused the pot to go whacky, unless it was just a coincidence.
As for the ghosting, I decided to inject IF straight into the board since there was mention of RF, looking to chase the path of the signal. Luckily my blonder tongue's IF frequency is the same as this TV's so I unhooked the tuner entirely and connected the IF out of my blonder tongue agile modulator straight into the set, and now the picture has zero ghosting.
Here's a picture of it in operation now:
https://i.imgur.com/nTcNGbU.jpg
So now I've come to the conclusion that for the ghosting one of two things may have happened. Either the RF modulator I am using (not the blonder tongue but a cheap Radio Shack one) failed, or during the surge it damaged the tuner itself. I'm going to go with the grounding recommendation that was mentioned here, as it honestly seems like RF reflection. I'll be checking everything later. For now the IF injection looks actually better than even before all this happened so I might even consider just keeping it this way, looks almost like composite video directly being fed in.