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Ken, most consumer image printing services such as Costco & Walmart assume that the image is in sRGB color space. Your images are in AdobeRGB color space, which is a wider gamut space than is sRGB. As a result, the resulting prints will be flat and desaturated. However, in looking at your images, the scan looks even more desaturated than I would have expected for AdobeRGB. On a hunch, I downloaded your "good" image (actualjpgimage.jpg) and opened it in Photoshop. As I suspected, the image is actually in ProPhotoRGB which is an extremely wide gamut color space and is the native working space in LR. Your original image looks very good in PS, virtually identical to what you posted. However, if (in PS) I assign an sRGB profile to it (what would happen if printed with an assumed sRGB profile), the image looks very dark, flat and desaturated (very close to your scanned print image).
You need to figure out how to convert your images to sRGB color space and save, then send the sRGB images to be printed. I suspect that you'll be happy with the resulting prints. Unfortunately, I don't use LR, so I can't tell you how to do this.