I am not sure how many clutches I have incubated at that temp. There have been 50+ anyway at that temp. I cut eggs at 57-58 days. Hmmmmm now that I think about it I guess the lower temp probably actually added a few days not 2. In your case though I would wait because this is your first time doing it at cooler temps. To be safe I would let one pip first. After cutting mine they are usually all out within about 5 days. Out of all those clutches I can only think of 2 I needed to assist feed. One I only assisted once and it took off. The other was very stubborn and took probably 7-8 assists. However after she took on her own she rarely misses a meal now. She is almost 3 years old now and is close to 3000 grams if not over now. I don't ever get any real runty hatchlings though. I am not sure if that has to do with incubating temps or other factors though.