That temp offset setting is tricky...I never got it quite right.Here is something I noticed with the IncuView. My house is roughly in the 69°-70° range sometimes hitting 72°.
I had the IncuView set for a room temp range of 70°-80°. I had a 1.2° temp offset to calibrate the unit temp gauge to read correctly. I changed setting to room temp of 65°-70°. Now my temp offset is down to .5° to calibrate unit gauge. Conclusion being if your having to set a high temp offset to have the unit gauge read correctly maybe you have the room temp set wrong. Anyone else experience this? Yes I am making minor adjustments with eggs in and also monitoring very closely.
Change only one thing at a time, then wait at least 2 hours for it to stabilize.
All incubators work best in a room with a stable temp of 70-80.