Certain arcade cores not syncing to arcade monitor?

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I'm not sure if I'm missing anything in the .ini here but with the low 50hz frequencies on Robotron 2084 and Kung Fu Master cores I'm experiencing de-sync issues on my MS-9 monitor. I've run the actual board on Robotron on there and this plays fine along with NBA JAM which also runs at a 54hz frequency so I know they work. I'm wondering if there is anything I need to add to the MiSTer ini to get these cores to sync with my monitor?

Thanks

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Aha, composite sync to 0 did the trick. All sorted