Fatigue test with cable clamps axial loaded

In a previous post I tested cable clamps (EN 13411-5-1) in axial load.
Now I wanted to find out what happens when cyclic loaded. 
I choose a load of 15 kN because it is 2,5 times the allowed force that may occur in a safety system of a ropes course when a climber falls. 
In fact, there are 3 kN maximum, so we have a safety factor of 10.

Very roughly speaking:
The fatigue resistance of steel is about 50% of the breaking load, that means, if a clamp breaks at 30 kN it should be resistant to fatige if loaded with 15 kN.

Here is my assembly. I tested 3 clamps. As a side effect I also tested some steel wire terminations and aluminum carabiners.

The two carabiners failed after 8.200 and 8.700 cycles. The MBL is 35 kN. After

 
The cable clamps did not react.

I did the breaking load test:

Breaking  load was
32,84 kN, 37,38 kN, and 44 kN.

This is like uncycled clamps.