I have 6 ARS hatchling racks and have been utilizing them the same way for about three years now (the previous two years I used them differently). I used to move females out of the tubs at about 500 to 600 grams and put them in a CB-70. A lot of my girls quit eating. So, I since changed that, and now I keep a female in the ARS hatchling tub until she quits eating (her sign to me that she is no longer happy there). This typically doesn't happen until about 800-900 grams. However, with that said, I have some 1200 gram females still eating in their hatchling tubs.
Let the snakes talk to you.