Tony, I saw your posting in the Maryland trip reports along with your questions regarding the collection conditions down that way.  Well, let me first say that my experience with collecting down that way seems to be on par with what you have observed.  Ive' been to Matoaka cottages several times, only to find a couple of very worn small teeth/fossils.  The best I've seen anyone do there was 3 large Isurus ziphodon makos, but they found them by snorkling about 30 to 50 feet off shore in the shallow troughs.  All I ever see at Matoaka beach are billions of shells.  I'm not sure where the formation is along that stretch of cliffs that contains the fossil teeth - perhaps it's actually in the water and not exposed above the surface in the cliff?  Try searching for some geological documentation through the Maryland Geological Survey to see which layers have the fossils, and see where they are located along the 30+ miles of cliffs.  This will help point you in the right direction I believe.  I do agree that the Megs get larger as you go south along the cliffs.  Up north along the cliffs, you have to be real content with nothing generally larger than 3+ inches, although I have seen larger ones found but they are quite rare.  The 4" to 5" teeth become more common towards Plum Point, Parker's Creek, Scientists Cliffs, etc.  Unfortunately most of the areas along the cliffs are private property and can only be accessed via landowner permission or by boat as I see you have done.

Good luck. Persistence pays off.  I've been to the cliffs probably 1,000 times or more.  Eventually you find something nice.

Daryl.