In your first post you said:
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What I am noticing is my color saturation is very flat.
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In this post you say:
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What it appears is that I am losing Hues.
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So are you saying that you are having a problem with both Hues and Saturation? And what do you mean when you say the saturation is flat, or that you are losing Hues? Can you show an example before you do any processing? What kind light are you viewing the prints in?
NOTE: Very Important. It appears you are saving your images at greater than 600 pixels in one of the dimensions. If this is the case, then GG will resize the image and set the JPG quality to medium to low which will affect the color as well as the artifacts. Here is an example of both artifacting and color shift due to this problem:
Left photo was 600x400 when uploaded, so wasn't resized and has the proper color and no artifacting. Right photo was 601x400 when uploaded, and you can see the drastic difference after it was automatically resized by GG.
So check that out first, that you are saving it out of Photoshop so that the finished size is 600 or less for both dimensions. In the photo that you posted here, it is 600x400, but the file size is 33822 which is about half the size that one would get with a "high quality" setting in Photoshop. That the first line of attack is to make sure you're saving it out at the right size.
Cheers,
rfs