Was the fin keel that you sailed a new design or the older style that most of us are use to? Remember the new designs are totally different in rudder, hull, and fin makeup. But I have seen that problem in the fin keels of the 70's 80's 90's and early 00's. Those boats of that era were hard to sail in confused seas and I would have taken some form of a full keel any day over fin. But times have changed and boat design is moving on and I think to a better place.
If you are going to through all full keels into one category and point out the disadvantages that apply to some. You should be prepared to consider all fin keels. This thread is "fin vs full" not "the worst of the full vs the newest/best of the fin"