I got 6 Khaki Campbell duck eggs in the post which, right now, are on day 10 of incubation. They all have saddle-shaped air cells (some worse than others) and 4 are developing. They're being incubated upright and turned 45° 3 times per day. Should I lay them down in the last week (the air cells aren't rolling)? The incubator settings are 37.5°c and the humidity is kept within 35-50%.