Why CTM does not use the remaining resource capacity?
Check the resource calendar. If the calendar days are maintained from 0:00 to 23:59, such calendar maintains an interval of 1 second non working time. This break prevents the complete consumption of the capacity of the resource: orders start one second before the next higher capacity is available. Maintain the days from 0:00 to 24:00. This applies for shipping calendars as well.