8 folks up top would not bother me at all.
I would watch the movement of the folks and ask they would not all rush to a rail at once.
With the open viewing area , nothing would be gained by charging from side to side .
Sea conditions would count. The extra weight up top would slow the roll , but it would go further.
I think the folks would abandon the area as the roll became a PIA , when they had to hang on.
Be observant , but it should be a nothingburger.
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