Pov's works reminded me of the tilling, leveling of our avocado finca which was located on a hilly area of 1 hectare. What she is doing is a backbreaking job and I salute her for that. Your slope is like most of the land we have in Spain and the good solution as what you said is to plant trees or bushes to stop soil erosion. Slowly but surely, I know it will be a wonderful place. CHEERS!