Geeetech

I believe the DELTA_RADIUS attribute is what you need to adjust.
It's for the condition where the outside point are level but the center is not.

I am having the same issue with the 2C-Pro. The second extruder is almost a liability. It will hit the object being printed sometimes and cause chaos. I finally just removed the extruder tip to get it out of the way. I also put small aluminum blocks under the bed to level it better than just using t...