Maybe try not cooling at all. Your breeders are already in the mode to breed and it's possible the bump back up in temps will force the subadults into eating again. Alot of people have great success with not cooling at all, so this may work for you, or they may be stubborn and still not eat. I had a girl who was bred but didn't go last year and she didn't eat a single thing for 6 months last year, another who didn't breed and didn't eat for 4 months.