Switching bators, really helped me accept the temp and not play with the settings. I just put them in. It was really a "set it and forget it" situation. I have the automatic watering system on mine. It works. My humidity stayed right about 65% through the whole process. I have read some don't...
Excellent idea with the glass marbles. I canned using my cheap Styrofoam due to temp fluctuations just as you described. Maybe it was my electronicS OCD and the need for very specific readings that ruined it for me. I felt I was in constant adjustment. Up and down up and down.
No the short...