I have no idea why you see what you see. It's a complete mystery to me.
I'm currently in school in addition to working, so I can't spend too much time here. I just don't have enough spare time, so I can't test it for you... Wish I could help more.
Good luck with your adventure. Can you find a way of maintaining the developer temperature at a higher level? Like a fish tank heater, hot water jacket, tray warmer (there are some stainless steel ones recommended to me by Max Marinucci that look nice)... There are many ways to do this. I used to have a space heater with the trays on wire shelves, and the heater directly underneath. That worked really well too.