Some fiberglass boats, and all boats I suppose, are not perfectly symmetric. Even a very small asymmetry in the hull, particularly with respect to the alignment of the keel and rudder, could cause a noticeable difference in performance on different tacks. Moore 24's were supposed to have this problem in some of the early boats. That, and/or the listing you've noticed could easily explain the performance difference you're seeing.
Never forget them. Do something to prevent it from happening again.
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