Hello
The goods receipt processing time is also considered when the rescheduling date is calculated. There is no setting on the system to make the rescheduling date to be calculated without considering the goods receipt processing time. The only way achieve what you want is to remove the goods receipt processing time from the material master.
Another possibility would be try to use BAdI MD_CHANGE_MRP_DATA to influence the results, but I believe that it would be a very complex logic to be implemented.
BR
Caetano