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Are you certain you have the correct value capacitor across the horizontal coil? Even if you do you could try changing the value and see if it brings it into range.
I think this is more an issue with the Horizontal Oscillator speed rather than a Sync problem, I would look closely around the 6K6 Osc tube, particularly cap C96 (assuming you're using the Sams?)
Can you make the horizontal flop both directions or does it never reach the point of straightening up?
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