The answer is yes, the cross bracing will help. It's amazing the difference.
We have a similar setup, 4'x8' sections, wooden with metal post. The former owner didn't pound the post in far and had cross bracing only on the last section. We have a 23' tri-toon and I was a bit concerned about the dock. Last year I pounded the post in and put on a second set of cross braces and then added whips, these additions really helped.
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