Of the 11 eggs I received from Metzer Farms (they shipped to Alaska) 1 was infertile and 2 showed signs of a blood ring early on. I'm on day 18 with the remaining 8. I kept RH at 45% for the first 13 days. Weight loss wasn't within the 13-15% for ducks so I decreased humidity to 35% for the last 6 days. Today, at day 18, weight loss is still under ideal. Eggs have been losing an average of 2.7g/day when to be at 13-15% loss, they should be losing closer to 3.4g/day. These numbers are based on a start weight (for 8 eggs) of 600g. To catch up the loss over the remaining 7-10 days, I need to lower humidity to 20-25% (I think). My question is, is this low level too low for the last week? Will they lose weight in a harmful or undesirable way?