Thanks for the thought Edward. My pan is 15Kg (about 33lb) and although I have to do a deal less when doing the strawberries it's still about 8Kg - and indeed I want to buy a bigger pan to do a lot more. The pan at that size crashes the product down quite hard and it breaks and/or the chocolate breaks off and the product beneath starts to come away too. That is not the same issue on a very small pan.
I only temper the couverture to apply it to the first layer - the "quasi-enrobed" layer which is what I am trying to find a cure for. The final layer tempers itself with the movement of the chocoate - at least so I understand it. I'm learning REALLY fast!
I do like your thought on the a/c with the mask! I have tried that myself and I'm going to try again. Last time I didn't have a large enough pipe and the air didn't get through and it was not cold enough either (rated at 18 degrees C although it gets colder than that).
Now I am battling relative humidity too which seems to be a trade-off between temperature and R/H. Aaaahhhhh!!!! Needs to be low to get a decent polish on the panned product. I mention this as where I live the humidty is too high to take it into the hallway.
You are clearly an innovative person! Love your thinking!
Thanks for your help
Colin