Thanks Randy, indeed it flies very smooth and stable, even in windy conditions.
Little more I forgot to say:
no governor on the ESC has been used, so in the full param list H_RSC_MODE has to be set to "3" and in the attached .param file the end points for the curve can be found.
On a 3s 1000mAh battery endurance was about 12 minutes at 20%.
Something more could probably be achieved lowering HS but in my case became a bit bouncy under windy conditions, so I decided to leave HS higher.
Here attached the parameter file for PIDs and things, good as a starting point (the videos were flown with AC3.5 and the attached params) . B180_pixracer.param (13.5 KB)