So CP3 and CP4 had problems with sharing the same sector. Can you make smaller sectors to help prevent this?
CP3 and CP4 are not sharing the same AI sector. That would be bad.
But the CP4 left coordinates are inside two different AI sectors ( sector #10 and #16 ) that overlap because of the crossing. Wreckfest does not like this.
Moving the CP4 coordinates further away from the crossing, by added a new sector #17, now both left and right coordinates are in just one AI sector.