I just finished Dinner--It was Friday night Tacos!
There is not much you can do now but see how they hatch and on what day. There is nice development in the eggs so you may not be as far off as you think.
If the temperature was too low, the will hatch late so I would not put them into lockdown until day 19 unless you see pips. Watch them for sticking and egg goo.
My guess is that the temp was not as low as you think.
I think this is what's going on with me... Temp too low, hatching late...
Yum tacos! We did Chinese tonight.