Does anyone have anything good to say about the K2 with CFS?

Ok, you are right but I did not experience problems so far printing ASA for example, I have some 8 year ABS which I use only occasionally for functional smaller part but since then I only use ASA because of less warping and no smell.
You may adapt my How to set Z-Offset based on used build plate and filament with simple klipper macro macro to add z-offset for ASA as well.