I'm thinking of doing some c-41 processing using a Jobo CPP-2 and a 3010 expert tank. Kodak Flexicolor chemistry if I can get it. Mostly 5x4 160Portra VC and 400PortraNC. In my reading I see that the developer step is typically 3 1/4 minutes. I'd like a longer processing time (for consistency and to perhaps let me do a 1 stop pull on occasion). Say six minutes or so. The obvious way to do this would be to lower processing temperature to, say, 28C from the normal 38C. So what happens if I lower the processing temperature? I don't want to compromise film quality (color shifts, loose shadow detail, that sort of thing). Anyone have any experience an/or insights they'd be willing to share on this topic?