That could be part of your problem....did you do your first couple of cycles in that very high humidity state and go for 6 hours at a time?? Part of the "blue" appearance of the finished metal is the chemical compsosition of the formula, and some is the simple refractivity of light on the surface finish. From what you've said, I'd suspect you have a overly matte finish at this point, and it's gonna look blacker than it would have is the metal still had a sheen to it. You should never take the first rust cycle over 2, 3 hours max, even if youre not seeing red or orange rust. This lays down a fine oxidized base that still shines, but will protect against over-etching on subsequent cycles.
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