To be clear, I think its well within everyone's rights to ferment at 67, then drop to 60 for a D rest. Personally, I only drop my fermenter temp for two reasons. 1. Is when I finish my lacto at 98 and drop to 68 to pitch brett. 2. Is when I drop a finished beer to 30 for gell fining. But I would be totally ok if I was the only one who did that.