Well it's back to basics - Been tracking temp and humidity for the last 60 days thought I was doing everything correct. Targeting 99.5* and 30 - 35 % humidity If your instruments are not accurate it doesn't matter! When you read the incubation guide the first thing is check your temps with multiple thermometers - well I skipped that basic step and have been paying for it. The TRH 158 that came with my Dicky incubator is 2.5 degrees off (on the low side) - checked with a medical thermometer that was right on at 98.6*. I have been cooking my eggs - If I spike at 100, I have really been at 102.5* - no wonder I have been getting so many ducks that get to about 26 - 28 days and die. The ones that hatched have all been early - I thought they were Mules. I had great hatches with chickens, but ducks are not as forgiving. As we move into hatching season - please learn from my mistake - Now I am re-checking everything - Change batteries - calibrate hydrometer and thermometers On the bright side I do have 12 cute little ducks that hatched as I go through my learning curve.