Here are the results from test 2.
I think that test point 3 in the first graph is a non-LEGO brand brick.
One interesting reflection is that its not that easy to calculate the maximum height of the tower. Although the maximum force the brick can withstand is ~4400N it has deformed ~2,2mm at that time. That's almost 20% of the bricks height.For an accurate height you have to look at each individual brick and determine how much weight its subjected to and subtract the corresponding deformation,