Delta Kossel e BLTOUCH - Bad Autoleveling

Hi Guys,
I have the Delta Kossel with Marlin 1.1.8 and I installed the BLTOUCH for the Autoleveling, and after the Bilinear auto leveling I printed different circles around the bed for testing the autoleveling, but I have differents results and I can't print a large object...
I have many circle to high the bed, and after to low the bed, only in the center the result is perfect.


This is a video:
[www.youtube.com]
[www.youtube.com]

Bltouch:



Please can you help me?

Best.
Federico.

Do you have the probe offset entered into Marlin?
Since your probe is off to the side a bit, have you checked for any effector tilt?