The difference between 35 and 80 is why you don't have trouble
I use mine all summer with no problems. Come winter time in NH the temp recovery on the 40" MES sucks if you load it. I put an extra heater in mine, without that I might not even have got back to temp during the first few hours. Thinking about it, I probably didn't help the situation by storing the MES outside. the whole system was chilled to start with
I always rotate the shelves when they're all full. The bottom shelf can be 25~30 cooler than the top. I usually swap the top with the bottom and then the two middle ones half way through to even things out. I also like to mop ribs each hour.
This time around, I didn't want to lose heat by opening up the unit. I was an hour and a half late to the party as it was. Everyone loved the food, but I knew it could have been better