With a large sump 10X is perfect, you're right with a small sump that would be too much throw flow through your media. One thing that all experienced Cichla keepers agree with is 10x turnover is preferred. I have kept healthy Pbass for many years like this.
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What would be considered a small sump and what would be considered a big sump? I was taught less/no divisions is not a gd idea as the point of the dividers is to force water to flow through the media instead of over it as water always flows the easiest path.
Why is it that 10X is the best for cichla?