The reason why it is not uniform is because the conditions change.
Uniform response of an organism to uniform conditions would give a uniform rate of change. Even if there is a uniform response by the organism or population to its environment, nonuniform conditions would give a non-uniform rate of change.
Hope this helps. Do you have calculus behind you? It would help if you did. You don't need to really grasp fluxions and such, but I would explain it differently if you didn't.
I am asking where is the data?
You are the guy saying the spin is 1. I am the guy saying where is the data, how did you measure it?
You havn't shown how anything was measured to show evolution is not uniform. You keep saying why you think it is not uniform and how it makes sense that it should not be uniform.
That is not the same as showing it is not uniform. This is a serious distinction.