Are these eggs your's?
Is there a possibility of the eggs being Muscovy?
I once bought khaki Campbell eggs off ebay and the seller sent me Muscovy eggs.
If you still have movement and air sac is getting big, lock them down at about 38C and 65% humidity and practice patience...which I know is very hard, especially the first time or two incubating. Your temp has been a bit low so may take them a tad longer to hatch. Patience is key here. Opening incubator drops humidity, so try your best not to open. After 3 or 4 days if still no sign of getting ready to hatch candle then. If egg starts rocking or you can hear peeps continue lockdown and do not open, let them do their work. Duck eggs take much longer from internal pip to external pip and hatch than chickens.