I am late to the welcome wagon, but as they say, better late than never!
Welcome to here, Jay. I have enjoyed reading your posts and look forward to reading more of them.
We have some things in common, including thin mountain soil. It's hard to grow anything besides rocks!
What I did to fix it: I have a habit of chopping weeds of all kinds (just before flowering) and dropping them in my garden as mulch. In the fall, I add leaves. I rake leaves, roughly chop them up (easy to do when thoroughly dry) with a lawnmower, or sometimes my kukuri machete. Just enough so that the leaves don't form an impenetrable slimy layer in my garden. (The job is super fast and easy with a lawnmower: pile the leaves up against the side of a building or stack of hay bales and run the mower over them so that the cut leaves are flung against the side of the barrier instead of all over creation... then I can scoop it us and use as mulch.
Now, after a time of doing this every year, I can grow anything in the black gold that I have made. The thin soil is still there beneath the thin "new" soil I have made, but it is constantly being nourished by the decomposed weeds and leaves.
