Ben,
I agree with Billy and others that you may have a good spot there.
I have noticed over the years that seng grows big and healthy and best in soil that has a lot of rock, rock chips, flakes, etc - in it.
It does require a high calcium content to grow best and I suppose the rock supplies that well.
Here is a few pics of some I dug on Sept 3 about 1/3 way up a 200' rock bluff. Notice how healthy that root was (lots of root hairs) and big and fat too and notice the soil is loaded with rock.
TNhunter