You can try to change Chain tolerance, 2mm will be good. But. If first face have a 3corners and second face have a 4corners - it will be impossible. Depends your cut direction you can chose Next Row. If not - extract faces, remove trim. If not - upload your prt. Or send me.
Try using Streamline Drive method and select the faces to be machined in the cut area.
I this is not real part, but sample part for training.
1. With Surface Area strategy will be impossible to mill this part. May be StreamLine will be more better.
2. If you want Surface Area - I try to generate one toolpath for fillet for tool with R1.2 and Tool Axis away from Cylinder Axis.
And second path as Sequential Millind for Ball Mill, normal to part.