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Your final result with the B&K 415 input to the tuner is obviously correct.
It's the overall result of signal going through the whole chain from tuner to picture that needs to be correct. The odd result when going in at C1 may be the result of the video detector circuit being loaded by the signal cable, plus, it is possible that both the SAMS and the Zenith documents are screwed up in not recognizing that the chroma bandpass by itself should have a tilt that compensates for the IF response.
Declare victory and move on!
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