By pre-soaking twice, not just once, it fixed my C-41 processing problems that I could not find the cause and fix for years. I will strongly recommend pre-soak twice for E-6 too. This is particularly true for Jobo ATL processors. Mine is an ATL-2300. The processor pre-heats the tank by rotating it over the water bath. It just never really pre-heat the tank enough. Pre-soak once does bring the tank temperature closer but do it twice does it perfectly. The credit goes to PE. He recommended it a long time ago. I did not understand what he meant to do it twice. It was a wake up call that I missed.