Haven't heard of overzincing a fiberglass boat...but have seen some issues with bottom paint that I would have to refresh my memory what the exact cause and final issue was.
I think most trim tabs get zinced because the actual tab is electrically isolated from inside boat parts , so a hole and zinc are easiest.
On many glass boats you will see zincs on shafts, rudders, tabs and hull plates....so unless they are all oversized, I doubt you will have any issues.
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