Although not technically a shelf cited for freeze drying, the top of the tray assembly is wired and does heat. There are more than several of us that use the top of the heating tray assembly for processing. I watched the Blue Alpine assembly video on you tube, mentioning the bottom shelf is designed to operate at a higher temperature because it is in contact with the freezing surface of the chamber. I've also noted, as other owners have, that the top of the heating tray assembly generally doesn't work quite as well as the other shelves, presumably because of it's proximity to the chamber wall. While processing, I've noticed the ice retracts from the where the top is closest to the heating tray assembly because of the heat transfer to the chamber wall from the top of the tray assembly. Is it possible to replace the top (lid?) of the heating assembly with a shelf that is a higher wattage as is the bottom shelf? Certainly doesn't seem difficult to replace, just pop rivets and some wiring (I haven't ripped into the shelf power distribution block, is it terminals and wire lugs or soldered). Would the bottom shelf be too high of a wattage since it doesn't directly make contact with the chamber wall? Is there an 'in-between' wattage shelf that would resolve the issue of tray top performance when used for production?

Sorry to be a PITA, just trying to get the most out of the unit each run.