Hey,
Ive made and sold 50+ knives with procut and had very very consistent results. Phenomenal edge retention and edge stability. 1550/cryo/300 comes to 66.5-67 every time, and for prybars (ive made 60 or so) 1700/cryo/ 400 comes to 61.5 every time. Just my guess, but delam and cracking comes from uneven temps when quenching not anything from the mill. My guess is they overheated the outside of the steel (probably using a forge) and didn't properly soak the steel and that caused the delam and cracking. Also why they poked it 20 times to get a hardness reading, they were probably getting numbers all over the place which is really unprofessional. Thats them trying to find one poke with a number that was acceptable so they could say it made spec. They knew something was wrong from the first 4 pokes, either they still have decarb or its under hardened.