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Have you tried adjusting the horizontal locking phase? Those RCA horizontal osc systems allow you to synch early or late enough to roll the sync bar into the viewable area. The color circuits are gated off flyback pulses IIRC so you may be able to fix the gate timing with a simple adjustment of the horizontal.
I'd try that before going off into the weeds of adjusting a color circuit that is producing the correct waveforms.
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