Adding Composite Input (Capacitor Question)

[ARC Tech-109]

Reason for the sync sep chip is so I can use non standard or poor sources and maintain a good lock, I also run everything on a master BB source and an external/internal sync switch was in the works.
Shading seems to defiantly be in the XZ demod section. I thought it was input video related but noticed on some scenes things appeared to have this sort of trailing color smear along with very intense reds and blues. The 6MK8 checks out and I have several new examples of this tube along with the 6HS8 demod. I can turn the color control all the way to zero and even short the pot to ground and I still get a shading that varies with the tint control. If I pull the 6HS8 or 6GH8 3.58 osc tube the shading goes away, where or how this is leaking in has me stumped.