John, I certainly get impatient as well. I guess I have realized I have more ideas of projects than I will have the good health to do them! I need to slow down. Other things I would never realize until I get there no matter how carefully I planned.
I also agree with Rubin about the vertical transition of the grades. Since I was building inclined to the height you are and have less space, I had to work on the bottoms and tops of the two grades. At the top the pilot wheels of some steam engines left the track. I had to shave down the sharp transition at the top.