In my experience, most fin keel boats that I have owned will heave-to about as easily as the long keeled boat that I have owned. This is only to be expected since heaving-to is more dependent on sail balance than the keel shape.
Where keel area and shape comes into play is that fin keels will tend to stall sooner than a long keel and so produce less side force. This means that the fin keeled boat makes more rapid leeway than a longer, more traditional keel. This results in a bigger slick (rather than a smaller one).
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay