It does seem odd that you selected a CMU wall in your cold climate where deep footers are needed. But maybe the shallow bedrock eliminates the need.
I live in a mild climate where deep footers are not needed. CMU walls are common and many of them fail. The construction of walls is not controlled here or permits required. A lot of walls are DIY.
Around here most CMU walls fail because of inadequate width of footer, inadequate steel re-enforcement from footer to wall, and lack of vertical steel and concrete fill in the block voids.
Block masons often build walls that fail when they do as they would for a house foundation. Walls for a house have the added weight of block above the ground as well as the house, and the house floor locks the top of the wall for lateral stability.
Homeowners are often successful with 2 ft high walls, but a DIY wall more than 4ft almost always fails. Homeowners just do not understand that a 4ft wall has many more times the force against it than does a 2ft wall.
The sketchups you provide do not show the height or separation between walls.
I wonder where you are with the topo map? Maybe you dropped it, since you weren't successful hiring an engineer. The map was important to the engineer and is even more so to you. Here is an early map of my property before I started my wall project. (walls in blue, about 400 lf)