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Kev, You would need to go to a full size ball head for that kind of loading.
The only ones I would suggest would be larger the aspherical ball mounts by ArcaSwiss or the Really Right Stuff BH55, unfortunately they are not cheap but are the best I have ever bought.
You would also be well advised to drill/tap the dovetail plate so you can fit a grub screw to lock the ballhead into place.
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