Darlene:
First off, chocolate doesn't have any water in it, so you're not letting it dry, you're letting it cool down so that the proper crystals form in the cocoa butter. If you're working in a room that's 68F you don't necessarily need to go a lot cooler. I would start out thinking about the Rev 1 - and for that I need to know if the marbling effect you refer to is new, or is something that's always been an issue.
How long do you wait to start pouring after the Rev 1 beeps at you and tells you it's ready?
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@DiscoverChoc