>> I am just down right too impatient to let time do the work.
I know what you mean! Me, too. I have a small hill of clay that I excavated and have not yet amended - not even enough to grow a cover crop (to the extent that one will grow in deep shade!
I love your boulders. What could be more stable than a boulder sitting on the ground? My guess would have been "those ain't going NOwhere!".
If you glue them down with heavy clay around the bases, I think you'll need dynamite to move them.
Even tall, thin, skinny stones are stable enough if you lean them against something. If I tidied mine up every 2-3 years, they wouldn't even tilt erratically.
