You may contact records section to find out how to request copies. Their DSN is 665-2353 or 2371. I've read the page, and understand that my PRF cutoff is 21 April for the 18 Sep Major's board. There are 106 on the list. An average of 9.64 per month.
All lists are smooth flowed.
Increment for Aug 99 - Feb 99 was 10 per month. An alternate schedule could have been to alternate between 10 and 9 per month for the entire list. This would have distributed the average more evenly over the pin-on period, however, the schedule followed promoted people faster. Orders are not usually cut until after the promotion consummates. This is because officers have until 2400 hours the day before the effective date of the promotion.