The skin recreation is looking good, but the file handling is horrible. Tire texture has the same size as the main car texture.
Why do you use an 4K uncompressed texture for the skin map when there are only 2 colors and no details? An compressed 512 px texture does the same job and is fracture in filesize.
Sadly the tires are bad, too.
Only one-colored grey sidewall, no information alpha, bad file handling and why is there no blurred tire texture?
And something is bugged with your dds-export settings, as i can only open half of the textures in PS.
As a guideline: orientate at standard file settings, sizes and compression methods (DXT5 / DXT1). Use more resolution and file quality where it does make a big visual difference, like a 4K main skin texture instead of 2K. Check if a texture really needs an alpha channel.
I didn't rate your file yet, because of mixted feelings. Feel free to take a look at my latests skin, how i do set my texture files:
http://www.racedepartment.com/downloads/2018-superbowl-52-corvette-c7r-skinpack-2k-4k.19500/
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The 'Audi Sport' text on the engine cover is white.
View attachment 234291